If you’re wondering why we don’t offer battery replacementsfor Citizen Eco-Drive watches, it may shock you to realise that your Eco-Drivedoesn’t have a battery in it at all.
- Citizen Gn 4w S 12g
- Citizen Watch Gn-4w-s Battery
- Citizen Eco Drive Gn 4w S Instructions
- Citizen Watch Gn 4 S Battery
- Citizen Watch Gn-4w-s Battery
- Citizen Gn 4w S 9
A case number (A string of 4 and 6-figure numbers ie. Xxxx-xxxxxx or a string of 4 and 7 alphanumerics ie. Xxxx-xxxxxxx) is stamped on the case back of your watch. The first 4 characters of the case number is the movement number. Notes for the movement number: The location of the case number of each watch depends on the characteristics of that. Click on the Watch Battery to find the alternative Watch Battery for your application.
The way a Citizen Eco-Drive works is that it runs off lightas its power source, not a standard silver oxide battery. The technology insidea Citizen Eco-Drive can generate power from any light source whether it isnatural or artificial and also from dim light sources.
This all sounds great and has even won some awards forCitizen in Japan as their Eco-Drive technology has won acclaim for itsenvironmental protection. Citizen even claim that their Eco-Drive watches donot require battery replacements which sounds like the perfect answer to theproblems of regular quartz watches that only last up to 5 years beforerequiring a repair. This is all true butyou may be wondering why your watch has stopped even though it’s been exposedto light and has been charged to maximum.
What may have not been mentioned is that the light, whethernatural or artificial still needs to be converted into power to run the watch.This is where the capacitor comes into it and where your repair starts.
At Fix My Watch, we can replace the capacitor in yourCitizen Eco-Drive, no problem! It may not need a battery and reseal repair,however it’s still not working for you and so we will collect your watch,change the capacitor, reseal it correctly and despatch your watch back to youwithin 24 hours of receiving it.
We do love our Citizens and especially the Eco-Drive. Theirdials are so beautifully complex and provide you with almost as muchinformation as a smart watch (well, one that’s not connected to the internetanyway).
Check out these Citizen Eco-Drive watches we repaired in ourworkshop recently and you’ll get an understanding as to why we love them somuch.
If you need your capacitor changing in your Citizen Eco-Drive, get a free https://repairs.fixmywatch.co.uk/citizen-ecodrive/quote to collect and repair HERE.
If you’d like to chat to us further about how your watch ticks, check out some other blog articles or get in touch.
PROMASTER
Citizen introduced the Ray Mears Promaster Tough series in 1989.
The Ray Mears Promaster Tough series included watches in the categories of Land, Marine, and Sky. One slogan they used to describe these was: “Citizen Promaster watches are the ultimate choice for professionals and serious enthusiasts. Venture beyond experience”.
The symbol chosen for the Promaster series is shown above, and is very similar to the pheon used to mark British military equipment.
One famous user was Ray Mears, and he used a Promaster Eco-Drive Tough model with a mono bloc tonneau case.
This article deals with the type of watch which he wore with a similar dial and a mono bloc tonneau case, introduced in 1999 and ceasing production in about 2007.
Other rear entry and mono bloc tonneau case Promaster watches exist with varying dials , but are not covered in this article.
ECO-DRIVE AND THE 7878 MOVEMENT
The technical platform that made the Eco-Drive possible was the caliber 7878 movement. This movement was the first light-powered movement with the solar cells mounted under the dial.
Previous light-powered watches from Citizen and other manufacturers had the solar cell(s) mounted directly on the dial. The under dial innovation was enabled by marked improvements in thin-film solar cells, which, by the early 1990s had become significantly more efficient. By locating a sufficiently translucent dial material over the now more efficient solar cells, enough light could pass through the dial face to power the movement. Although the Eco-Drive caliber 7878 movement solar cells remained slightly visible through the dial, the physical styling of the light-powered watch was no longer constrained by visible solar cells.
To store electrical energy the first Eco-Drive movements employed titanium lithium-ion rechargeable or secondary batteries. This battery type became available in the early 1990s, enabling an Eco-Drive 7878 movement to run 180 days on secondary power before requiring recharging via light exposure – a marked improvement in energy storage over previous light-powered watches. The movement also featured an “insufficient recharging” indicator. The accuracy of the quartz movement was stated as within ± 20 seconds per month at a normal temperature range.
If deprived of light for an extended amount of time, some later models could hibernate, and the hands of the watch stop moving, while the internal quartz movement continues to track the time accurately. When eventually exposed to light, the hands will then move to the correct position and resume timekeeping as usual. Thus, if you leave your watch in a drawer say for 4 months, then take it out and expose it to light, it will show the correct time immediately.
According to reports from Citizen Watches, experiments have revealed that the solar cells and secondary battery used in Eco-Drive watches will last for up to 10 years. They further state that the lubricants used in constructing these watches are built to assist with longevity, as the oil will not harden or evaporate, even over 20 years.
Some users may disagree with this.
THE PROMASTER “RAY MEARS” TOUGH SERIES
The 1999 Citizen catalogue shows the initial models in what has become known as the Ray Mears Promaster Tough series.
The two smaller models are PMU56-2481 and PMU56-2485, selling for 33,000 yen and 36,000 yen respectively.
This article will deal with these first.
7878 – H16714 TA OR PMU56-2481
This watch is a black dial version, with a small diameter, featuring the Caliber 7878 movement.
This is the JDM version with the Promaster symbol at the top beneath Citizen, and Eco-Drive in italics at bottom.
It features a solid one-piece Duratect titanium mono bloc case, extra-thick sapphire crystal, is antimagnetic, shockproof and 200m waterproof.
Duratect is a process where the surface is hardened, to protect the watch body from small scratches.
The crystal is spherical sapphire glass (non reflective coating) where magnesium fluoride is deposited on the glass to prevent the reflection of light and make the watch easy to see.
Case diameter is 38mm including crown, with a length of 40mm lug to lug (tip to tip of lugs), and 10mm thick with strap width 18mm
It came on a kevlar strap with all titanium hardware.
The dial features a triangle at 12, rectangular indices at 6 and 9, a date window at 3, and thick lumed numerals elsewhere.
Below on a replacement NATO strap.
The image below shows the original kevlar strap.
At 6 the dial reads Eco-Drive, WATER 20 bar RESIST, TITANIUM.
The case back is slightly lipped at the edge.
The text on the rear of the case reads:
Eco-Drive, CITIZEN WATER RESIST, (model number), ANTIMAG. 16000, TITANIUM, 7878-H16714 TA, GN-4W-UL JAPAN
Below is an image of the luminous properties of the watch, with the second hand “bulb” showing, rather than the pointer.
A blue dial version was also available.
7878-H21882 TA OR PMU56-2485
The more expensive model of the small series was the Yellowstone National Park series watch, again with Caliber 7878 Eco-Drive.
Here is the advertisement with both model numbers shown.
It came on a yellow kevlar strap with all titanium hardware, a yellow sweep second hand, and the dial marked with the Promaster symbol, Yellowstone National Park (in yellow) , WR 20 bar at 6 o’clock.
This is the case back of this model, engraved with Yellowstone National Park, and an image of the mountain and a bison.
7878-H30351 TA OR PMU56-2487
This is the Calibre 7878 Citizen Promaster “Tough” Ecodrive, special Mt.Cook/Aoraki Commemorative edition, (case marking: (7878-H30351 TA)). Titanium case, blue face, blue leather strap, domed sapphire crystal. Mid-size 34mm diameter not including crown.
Case back engraved with Aoraki, Mount Cook.
7828-H09971 TA OR PMU56-7371 AND PMU56-7376
This was also model PMU56-7371 on a kevlar band and PMU56-7376 on a titanium bracelet, as seen in the 1999 advertisement above. The caliber was now the bigger 7828 Eco-Drive, and the watch was bigger.
We have seen above that the bigger PMU56-2371 sold for 33,00 yen. The titanium bracelet version, PMU56-2376 sold for 50,000 yen.
The kevlar strap versions had a plate on which personal data could be engraved. After purchase, if you sent the necessary information on the enclosed application postcard, you received a titanium band engraved with ‘name’, ‘nationality’, ‘blood type’ and ‘date of birth’
PMU56-2377 and PMU56-2487 in the above image under personal data refer to the Mount Cook version.
Ray Mears Promaster Tough has given his name to the 7828-H09971TA, it being seen as he wore it often in his outdoor TV shows, as it was a titanium cased, bombproof, rugged, outdoor, watch. It was labelled Promaster, Tough.
The dial is identical to the smaller version, but green dial versions existed.
The watch has a Duratect titanium mono bloc case (no case back, the movement is front loaded). Duratect is 4 times harder than untreated titanium. Dimensions are 40mm diameter, 11mm thick, 20mm lugs. The crystal is a domed sapphire with anti-reflection material on the inside. The crown is screw-down and the watch is rated to 200m. Lugs are recessed slightly under the bezel which means many straps fit with minimal gap – it comes on a canvas strap.
The green dial model is shown above.
The titanium bracelet model came at 50,000 yen.
The text on the rear of the case is:
Eco-Drive CITIZEN WATER RESIST ANTIMAG. 16000 TITANIUM 7828-H09971 TA GN-4W-UL JAPAN
The caseback shows the model number, and that the watch has with the early 7828 Eco Drive movement, The code GN-4W-UL means monobloc case, upper opening, L-shaped gasket. The early movements have a 6 month reserve and none of the features of later movements such as parking the second hand to conserve power in the dark, and a perpetual calendar.
Later versions were referred to as PMU56-2373 , AP0600-01E with the Promaster symbol moved from 12 to 6, and fewer words on the dial. The case back remained the same.
Now the Promaster symbol is at 6 o’clock and beneath is simply, WR 200 TITANIUM
Below is a blue dial version of the AP0600-01E
The screw down crown was knurled and not marked with the Promaster symbol.
The kevlar strap versions had a plate on which personal data could be engraved.
Citizen Gn 4w S 12g
7828-H21963TA OR PMU56-2375
Yellowstone National Park commemorative model, on yellow strap.
Yellow second hand.
7828 H30369 TA OR PMU 56-2377
Aoraki or Mount Cook commemorative edition also with the bigger Caliber 7878.
Blue leather strap, but sometimes seen on a titanium bracelet.
7828 H09980 TA
A black (PVD) model marked base titanium on the case back. This had either a kevlar strap, or a black titanium bracelet.
Case back, kevlar strap.
Black titanium strap.
Or a gold model.
E766-T000894 OR PMT56-2711 AND PMT56-2713
PMT56-2711 is the blue dial Perpetual calendar Cal e766 E766-T000894 TA model and PMT56-2713 is the black dial version. These versions feature the titanium bracelet, and were 41mm in diameter.
PMT56-2712 is the blue dial Perpetual calendar model on a kevlar strap, and PMT56-2714 is the black dial version on a kevlar strap.
Citizen Watch Gn-4w-s Battery
The upgraded movement Citizen e766 – Eco-Drive with year power reserve (power saving and sleep modes), had a perpetual calendar and was accurate to 50 seconds a year. The dial was similar to other “Ray Mears” dials, except that the rectangles at 6 and 9 were replaced with pointed tapered trapeziums. The lumed numerals were all chrome trimmed. The second hand had an open bulb with a red pointer.
On this model, the minute hand moves every 15 seconds which is another power-saving feature.
It was discontinued in 2004.
This watch had :
Crystal: Domed sapphire
Case: 41mm Duratect Titanium (one-piece monocoque construction)
Bracelet: Duratect Titanium (800 vickers on the hardness scale with solid end links, push button with flip over double clasp diver’s extension).
The black dial version has perpetual calendar at 6 o’clock and just WR 20 bar.The numbers and markers have a very attractive blue lume.The PMT56-2714 model is identical but has a kevlar strap.There were also 30mm diameter ladies versions of these two watches, PMA56-2721 in blue on a titanium bracelet, PMA-2722 on a kevlar strap, and PMA56-2723 in black on a titanium bracelet and PMA-2724 on kevlar.And the black model on a Kevlar strap.E168-S081823 OR BN0110-06E AND BN110-57E
This is the RMC (Royal Marine commando) version, BN0110-06E on kevlar strap and BN110-57E on a titanium bracelet.This model used the Calibre e168 movement, and with thicker 2.5mm sapphire glass was water-resistant to 300m.The kevlar strap versionThe RMC watch had the following features.Case Back
SPECIFICATIONS1. Caliber No.: E1682. Type: Analog Quartz Watch with 3 Hands3. Accuracy: Within ±15sec/month (within a normal temperature range of 5˚C/41˚F to 35˚C/95˚F)4. Quartz oscillator frequency: 32,768Hz5. IC: C/MOS-LSI (1 pc.)6. Operational temperature range: -10˚C/14˚F to +60˚C/140˚F7. Display features: Time: hour, minute, second Date: date (models with date display)8. Additional features: Insufficient charge warning, Quick start, Overcharge prevention9. Continuous operating time: Approx. 6 months (from full recharge to stop) Approx. 4 days (from two second interval movement to stop)10. Battery: Secondary battery
E168-S082722
Black (PVD?) versions were also made.
B876-S081904 OR BJ9140-52E
The Citizen Royal Marines Commando Super Tough GMT watch is made from ion plated titanium and is fitted with a Citizen Eco-Drive B876 movement. The watch features ultra thick Sapphire glass (2.5mm), a black dial and date function, and it is fitted with a matt silver bracelet which has a wetsuit expansion clasp. The case back is engraved with the Royal Navy Ensign. The watch came with a special presentation box in the Regiment colours.The watch is about 42mm diameter excluding the crown with 22mm lugs and the dial is about 31mm.
The watch and strap are matt silver except for the thin strip on the case back. The divers extension for the bracelet is shown below.
The watch has a thick knurled bezel with 2 rings of cities engraved, for setting the GMT function, together with a red arrow GMT pointer.
BJ9140-01E
This is a kevlar strap version of the above watch in anthracite kevlar with a titanium plate for engraving.
Citizen Eco Drive Gn 4w S Instructions
BN0118-04E
This model is a recent release very similar to the RMC model, with the RMC removed. The calibre is still the e168. The model is still water resistant to 300m. The dial has been simplified, and the Promaster logo added.
The dial reads WR 300 in the same location, but the Promaster symbol, Eco-Drive and TITANIUM have been moved to 6.
BN0118-55EThe bracelet version is below.RECOMMENDATIONS
ENTRY
Citizen Watch Gn 4 S Battery
The best model to start may be the latest model, as it is readily available and represents the latest technology, and has fully charged battery and guarantee.While some later models of other manufacturers watch series take design elements from prior models as a homage, this is model is a continuation of the same design.
Citizen Watch Gn-4w-s Battery
THE KEEPER
Citizen Gn 4w S 9
The PMT56-2714 perpetual calendar watch is one which you can put on and wear without the need to adjust. The black dial model has a cleaner look compared with the blue dial.THE GRAILThe grail watch would be the original Ray Mears Promaster Tough watch, the 7828-H09971TA. The titanium cased, bomb proof, rugged, outdoor watch labelled Promaster, Tough.