Casio G-Shock Module Number Lookup
Every Casio G-Shock has a small number stamped on the caseback — the module number — that identifies the movement inside. Enter it below to see which model it belongs to and how to pull the exact manual, or read on for the full guide to reading a G-Shock caseback.
G-Shock Module Number Decoder
Enter the 3–4 digit module number stamped on the caseback (labelled “MODULE”, e.g. 3229 or 5611).
One module powers many models and colourways. For the exact operation manual, search the module number on Casio's official support site.
Casio identifies every watch movement with a module number — a short numeric code (usually 4 digits) that appears on the caseback of every G-Shock, Baby-G, Edifice, Pro Trek, and classic Casio digital. The module number is the key to two things: finding the correct instruction manual (Casio files all manuals by module number, not by model name), and confirming what a watch actually is. Because a single module is reused across dozens of models and colours, the module tells you the underlying feature set even when the dial and strap differ. This guide shows where to find it, how to read it, and how to use it to identify or verify a G-Shock.
Where to find the module number
Turn the watch over. On the caseback you'll see several pieces of text: the “CASIO” name, the water-resistance rating, the model number (for example GA-2100-1A1 or DW-5600E-1V), and the module number — a short numeric code, usually four digits, frequently printed inside a small outlined box or preceded by the word “MODULE”. That numeric code is what this tool decodes.
The distinction matters. The model number changes with every colour and regional variant (the same watch might be sold as -1A, -1A1, -4A and so on). The module number stays the same across all of those because the guts are identical. So when you want the manual or want to know a watch's real functions, the module number is the reliable identifier.
Common G-Shock module numbers
These are among the most searched G-Shock modules and the models built around them. A module can gain new models over time, so treat the model list as representative rather than exhaustive:
| Module | Models | Character |
|---|---|---|
| 3229 | DW-5600E, DW-5750, GM-5600 | Classic square, digital |
| 3159 | GW-5000, GW-5510, GW-M5610, GW-S5600 | Solar, Multi-Band 6 square |
| 3230 | DW-6900, GM-6900 | Triple-graph “Jason” |
| 3179 | GW-6900 | Solar triple-graph |
| 3195 | GW-2310 | Solar digital |
| 5081 | GA-100 | Analog-digital combi |
| 5146 | GA-110 | Analog-digital combi |
| 5611 | GA-2100, GM-2100, GMA-S2100 | Octagonal “CasiOak” |
| 3410 | GW-9400 Rangeman | Triple Sensor, solar |
| 5463 | GWG-1000 Mudmaster | Triple Sensor, mud-resist |
| 3184 | GWF-1000 Frogman | ISO dive, solar |
| 593 | F-91W, F-105W | Classic Casio digital |
Module and model pairings compiled from Casio caseback markings and community references; a model line can move to a new module across generations. Always confirm against the manual for your exact module.
Why one module covers many watches
Casio designs a module once, then wraps it in many cases. That's why the module number is more useful than the model number for understanding a watch: it pins down the actual timekeeping, the sensors (if any), the solar and radio/Bluetooth features, and the button layout. Two watches that look completely different can share a module and therefore behave identically, and one model line can switch to a newer module across generations while keeping a familiar name.
Using the module number to find your manual
This is the single most reliable use of the module number, and it works for every Casio ever made, not just the ones in the table above:
- 1. Read the module number from the caseback (the boxed 4-digit code).
- 2. Go to Casio's official support site and open the manuals / operation guide section.
- 3. Search that module number. Casio indexes every operation manual by module, so the 4-digit code returns the exact PDF with all setting, timekeeping, and function instructions — regardless of your watch's colour or the country it was sold in.
Because manuals are keyed to the module and not the model, this is often faster and more accurate than searching the model number, especially for older or region-specific colourways whose model code you can't quite read.
Not sure your G-Shock is genuine?
Popular G-Shocks like the GA-2100 “CasiOak” and GA-110 are widely counterfeited. Upload photos of the watch and caseback and get an AI authenticity check, model identification, and the tells that separate genuine from fake — in under 60 seconds.
Check my G-ShockUsing the module number to spot a fake
Sharp printing. Module present, boxed, and matching the model's real functions.
Faint, smudged printing and no clear boxed module — or a module that doesn't match the model's real features.
- ✖Missing or unreadable module number. Genuine Casio casebacks print the module clearly. A smudged, absent, or hand-etched module is a warning sign.
- ✖Module doesn't match the functions. Look up what the module should do. If the caseback says a solar/Multi-Band module but the watch has no solar dial or radio reception, the parts don't add up.
- ✖Wrong model-to-module pairing. A GA-2100 caseback should read module 5611. A different module under a GA-2100 model number suggests a counterfeit or a mismatched caseback.
- ✖Poor caseback finishing. Blurry text, wrong fonts, uneven screws, or a flimsy caseback are classic fake tells on popular models like the CasiOak.
Common G-Shock module questions
Is the module number the same as the model number?
No. The model number (like GA-110) names the watch and its colour variant; the module number (like 5146) names the movement inside. One module is shared by many models, so they are different identifiers with different uses.
Does the module number tell me the production year?
Not directly. Unlike a serial number, the module number identifies the movement design, not the manufacture date. A given module can be produced for many years. It does, however, give a rough sense of era — newer modules power newer model lines.
My module isn't in your table — what do I do?
The table lists the most-searched modules; Casio has produced hundreds. For any module, enter the number on Casio's official support site to pull the exact manual and function list. That works universally.
Do Baby-G, Edifice and Pro Trek use module numbers too?
Yes. Every Casio watch, not just G-Shock, carries a module number on the caseback and is documented by that number in Casio's manuals. This lookup approach applies across the whole Casio range.
Good to know
Module-to-model pairings here are compiled from caseback markings and community references and are accurate for the listed generations, but Casio occasionally revises a module or reuses a model name. For setting instructions and definitive functions, the manual matched to your exact module number is always the authoritative source.
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