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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.

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

  • 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

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.


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

Old one: 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.

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

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

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-6100C) 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


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