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What does the G-Shock model number mean?

The full model number of any G-Shock tells you lots of information about each watch. This diagram breaks down all the different elements:


Why do the end letters vary on some G-Shocks model numbers?

Some G-Shocks that are the exact same watch will have slight differences in the letters tagged on the end. Some times this is just a mistake by a retailer, but it's often the result of Casio varying the suffix of model numbers for various markets.


  • G-7800B-1 = abbreviated model number (usually export)
  • G-7800B-1DR = export model full number
  • G-7800B-1JF = Japanese domestic model number

As long as everything is the same up to the number after the second dash, it should be the same watch. There might be a different box or packaging though.

How can you tell the color of a G-Shock by its model number?

The first number in the third section of the full model number will usually tell you the color of that model.

  • 1 = Black
  • 2 = Blue
  • 3 = Green
  • 4 = Orange or Red
  • 5 = Gold or Brown
  • 6 = Purple
  • 7 = Clear or White
  • 8 = Gray or Silver
  • 9 = Yellow

Example: DW-6900MC-3JF is green.

What does the serial numbers on the back of a Frogman mean?

A Frogman serial number has 6 digits. A Dawn Black Frogman can for instance have the serial number 780123. The first digit is the year, while the second digit is the month. So this Frogman is produced in August 2007 (it could also be 1997, but that was not the year this model was produced). In the August 2007 run, this was number 0123.

So what happens in November and December you might ask. For November the second digit is an N and for December the second digit is a D. Here an image of a DW-6300, produced November 1993, number 260 of the production line.


What do the serial number on the case back mean?

The "serial number" engraved or laser etched on the watch's case back is not always a unique number, but often is more of a batch number that allows Casio to track when it was manufactured. We haven't gotten any hard numbers on how many G-Shocks would have the exact same number, but there has been a few confirmations of the exact same number on two different G-Shocks over in the Watchuseek forum.

The last letter can indicate the year it was manufactured:

  • A-2001
  • B-2002
  • C-2003
  • D-2004
  • E-2005
  • F-2006
  • G-2007
  • H-2008
  • I-2009
  • J-2010
  • A-2011
  • B-2012
  • C-2013

Example: 202A186H would mean it was produced in 2008.

Why do all Casio promotional photos show 10:58 as the time?

  • Casio chose this time because it best displays the numbers on a digital display. They chose the time and date because it optimally demonstrates the LCD's capabilities and takes up the most screen real estate. It's for the same basic reason that most promo shots for analog watches show the time as 10:10.

What watch is in the photo at the top banner of the Watchuseek G-Shock Forum?

Current Banner: Image:G_shockforum-new2.jpg - It's a custom stealthed DW-6900MC with a face protector.

Old one Image:G-Shock-Forum-Banner-7-18-08.jpg - GW-M5600, G-9000, GW-225A

Even older: Image:G_shockforum01.jpg - It's a G-300-3AV.

Why do some of the same model G-Shocks have different details or cases (like a "G" on the light button)?

  • Some models have variations. One detail might only be found on Japan domestic releases, and export versions might be slightly different in appearance. There's no difference in quality. Japan-only DW-6900 models have a "G" on the center light button, while export versions have a plain button with two raised horizontal lines. However, in recent years, some export models of DW-6900 are fitted with the "G" on the light button. Additionally, the 'G' on the light button may differ from region to region.

Japan (G) Export (No G)
Image:GW-6900GM-g.jpg Image:GW-6900GM-nog.jpg

The cases for G-Shocks can also vary depending on the market. Japanese 25th Anniversary models come in a black trunk, and export versions come in a round white metal tin with red and black print.

Japan (box) Export (tin)
Image:GW-5525-box.jpg Image:GW-5525-tin.jpg

Most G-Shocks come in this generic black cardboard box:


The model number is usually printed on a barcode sticker on the bottom of the box.

Why do some G-Shocks have "Fox Fire" printed on them?

The "FOX FIRE" text tends to only be found on Japan domestic release models. One possible explanation for the term comes from Wikipedia: Foxfire is the term for the bioluminescence created in the right conditions by a few species of fungi that decay wood. The luminescence is often attributed to members of the genus Armillaria, the Honey mushroom, though others are reported, and as many as 40 individual species have been identified. On the suggestion of Benjamin Franklin it was used for light in the Turtle, an early submarine. In the novel The Adventures of Huckleberry Finn by Mark Twain, the characters of Huckleberry Finn and Tom Sawyer use foxfire as a source of light in order to dig a tunnel. The export versions usually have the text "ILLUMINATOR" instead.

Japan (Fox Fire) Export (Illuminator)
Image:DW-5600E-foxfire.jpg Image:DW-5600E-illuminator.jpg

G-Shocks in Movies

G-Shocks In Movies - See G-Shock in popular movies.

G-Shocks in TV

G-Shocks in TV - this page covers all the G-Shocks worn in television shows.

Origin of G-Shocks being used by Navy Seals

Is it true that Seals used to be issued Rolex's to be used as cash if they ever got stuck somewhere? If so, do they still issue them. If not when did they stop?

"Sooner or later this subject was bound to come up why and who was responsible for the discontinuation of the issue of the Rolex watches.

First, it is TRUE that Navy Frogmen were issued Rolex watches. While I have never heard of a Frogman using his watch for barganing, that is probably an ole Navy handme down joke. Each Frogman was responsible or accountable for his Rolex. Sometimes a watch would be lost during training, or a mission. But when you left the Teams, you turned in the watches.

In 1981, while I was the Diving Officer for UDT-11, I was tasked with operating the diving locker budget. Needless to say, it was my responsibility to ensure the budget was used effectively. Unfortuantly the high costs to repair a damaged Rolex, which by the way, stood up to nearly impossible treatment, was too high and at that time, and the advent of the new digital watches was making its name on the Diving Industry.

The Navy rules stated that a "Divers Watch" must have a sweep second hand", which was elimiated the new digital watches. I placed a phone to NAVSEA, who made the rules for equipment used in the Navy. I asked the simple question, "why must an authorized Navy watch have a "Sweep Second Hand"? I obviously knew the answer, but needed the answer to come from NAVSEA.

The answer: "TO MEASURE LAPSED TIME". So, I asked another question: IF that is THE REQUIREMENT for a DIVING WATCH, why not just say that the watch mush have a means to measure lapsed time, instead of a sweep second hand?

Problem resolved. I submitted a letter to NAVSEA, the rule was changed, and I started issuing the Casio G-Shock Watches instead of the Rolex. Sorry Rolex!

This change enable the diving budget to focus on much needed new diving equipment and there you have it.

Blame me for being efficient and effective with the UDT/SEAL diving budgets.

When a Casio watch was lost or damaged, the costs to replace was minimum and compared to the costs to repair a Rolex and the time it took to get the Rolex back, made all the difference.

By the way, the Casio G-shock watch did more than just measured lapsed time. Stopwatch, countdown timer..etc

Let me make a comment about the watches sold on NSC. You will find that these watches have been used and tested by SEALs. NSC does not compromise its integirty nor it's commitment to provide the very best. So have confidence if you do get a watch from NSC, you will also have a watch that has my SEAL OF APPROVAL too! Hooyah!


Lieutenant Commander, USN (Retired)

Navy SEAL" -frogman80


"When I checked into the TEAMS we were not issued dive watches! Almost all the guys used iron man watches because of the stop watch and the ability for it to light up under water so you could see your time! We swam 100 meters every 3 we could manage our dive plan based on time! Around 1992 Casio came out with the G-Shock Circa 92 (DW-6600C-1V) that had the larger button in the middle/bottom of the watch...and it stayed lit for 5 seconds without holding it down!! So you could just reach over and touch it....or just touch it once on your attack board...and be able to continue to kick hard and regain total control of the board....the more you kept your elbows on your side...the more accurate swimming the board was/ if you didn't have to hold a button down....then you could manage the attack board better!! The G-shock also had a larger easier to see the time!!! Everyone at our TEAM began buying them....because there was no comparison.....and it is still the watch of choice of TEAM guys!!" -bud/s 184



More on G-Shocks in the Military

How do you display the test screen mode on a G-Shock?

To get this screen, push ADJUST, MODE and START simultaneously.

Image:GW-9200-test-LCD.jpg Test screen on a GW-9200 Riseman. credit: Sjors

Two other modes: (ADJUST, LIGHT and MODE at same time) brings up "TLT". This is the tilt/angle test for the auto el. Rotate the watch towards you more than 40 degrees and the digits pop up. (ADJUST, LIGHT and RECEIVE at same time) brings up "SLR". This is the light sensor (for the auto el.) Go into a dark area or cover it with your hand and the digits pop up. -pasfreak (GW-5600BC-1)

Which G-Shock models have bands/straps with two (double) rows of holes?

  • Frogman (DW-6300, DW-8200, DW-9900 and GW-200 series)
  • Gaussman series
  • Mudman (DW-8400 and G-9000 series)
  • Riseman series
  • G-056 and GW-056 series
  • G-1000H series
  • G-5500 and GW-5500 series
  • G-7400 series
  • G-7600 series
  • G-7710C series
  • G-800 series
  • GW-002 series
  • GW-400 Silencer series
  • GW-810H series
  • GW-M850 series

What's the rarest G-Shock model in the world?

The rarest Gs on the planet have to be prototype DW-5000s from 1983. There were originally five. Today only three remain and they are in the hands of original team members who helped design, test and invent the first G Shock between 1981 and 1983. These prototypes look like the original DW-5000C-1A except they have "Project Team Tough" on the crystal. This wording was later added to the 20th anniversary DW-5000SP in 2003 to recognize the team and the 5000 heritage/origin. -casionerd

Where did the word GIEZ come from?

The best guess is that Casio picked this name for a series because it's a shortened version of "G-Essence".

What's up with the tiny -0- printed on the watch face (or other tiny text)?

  • No one knows. Some says is some sort of alien technology.
  • There's other text too, like Japan A or numbers. It's probably got something to do with the factory it's made, but there's been no official answer. If you look closely you'll find tiny markings on the face of most every G-Shock.

Where are G-Shocks made?

Basically G-Shocks are made in:

  • Japan ca 1996
  • Japan H ca 1984
  • Japan M ca 1994
  • Japan Y ca 1997
  • Japan T ca 1994
  • Japan K ca 1998
  • Thailand Y ca 1996
  • Thailand H ca 2005
  • China Y ca 1996
  • Korea C ca 1995
  • Korea T ca 1993
  • Korea Y ca 1998
  • Malaysia ca1995
  • Malaysia Y ca 2001

The letter after the country name may indicate different factory. The year indicates about which year the first watch was produced from the factory (best guess estimates).

Then there those Japan Y movement assembled in Thailand or Malaysia.

Some buckles are made in Indonesia.

Lastly there is Taiwan (but no Made in Taiwan)

Which G-Shocks have Screwback Cases?

  • AW-500, also AW-594 (World Cup '94)
  • DW-5000 (re-editions, DW-5025, etc...)
  • DW-5000C
  • DW-5200
  • DW-5400
  • DW-5500
  • DW-5600C, also DW-1983 (10th annv.) & SWC-05 (World Cup '94)
  • DW-5700 (re-editions)
  • DW-5700C
  • DW-5800
  • DW-6300 Frogman
  • DW-82xx Frogman
  • DW-8900 (SS, similar to MRG-100)
  • DW-8950 (Ti, similar to MRG-1)
  • DW-92xx
  • DW-99xx Frogman/Seaman
  • DW-9600
  • G-2000
  • G-2700
  • GL-110
  • GS-100
  • GS-300
  • GS-310
  • GS-5x0
  • GS-1000
  • GW-20x solar Frogman
  • MRG-1
  • MRG-100
  • MRG-110
  • MRG-12x
  • MRG-131
  • MRG-200
  • MRG-210
  • MRG-220
  • MRG-100x Tactician
  • MRG-1100 MR-G Frogman
  • WW-5100
  • WW-5300

- Initial list put together by Adam in NYC.

Where to Buy G-Shock Face Protectors?

  • Casio has discontinued production of the DW-5600 and DW-6900 face protectors (aka bull bars). There's no known source for buying them right now. They might turn up on eBay or on used watches elsewhere.

Little known facts

This section covers interesting bits of information about G-Shocks that do not fall in any other sections.

DW-5900G-1V: This export model was introduced in 1990. It is believed that there were 500 pieces produced not to specification. Evidently, the paint factory made a mistake and the logo was misprinted.

Casio G-Shock Military Issue:

  • Casio G-Shock 5600: NSN 6645-01-356-5944
  • Casio G-Shock 6900: NSN 6645-01-441-2762

Personal tools

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