Casio serial number lookup
A Casio serial doesn’t tell the year. The case back’s module number does tell you the electronics and the manual: 5611 is 91 models in Casio’s index.
The module is the 3–4 digit number in a small box (e.g. 5611); the model reads like GA-2100 or F-91W.
Try
Not a date
Module 5611: 91 models, no date
Read about module 5611: battery, functions and the manual.[4]
Models on this module (91):
GA-2100, GA-2100, GA-2100AB25, GA-2100AH, GA-2100BCE, GA-2100BM, GA-2100BP, GA-2100BWP, GA-2100CA, GA-2100CC, GA-2100CM, GA-2100FF and 79 more
Sources checked · How we source numbers
How it works
No date in the serial
Casio does not use unique serials on all its watches, and where there is one it does not encode a date the way Seiko’s does[1][2]. One site says some higher-end serials have six characters with O, N or D second, and that solar models carry an 8-character batch code[3]; it gives no way to read either, and the other sources disagree, so the decoder shows such codes as they are.
Module and model
The module number, 3–4 digits often in a box, names the electronics; the model number names the watch[2][3]. Casio’s manual search links 3,274 models to 590 modules[4]; enter either and the decoder finds the other, and links our module page where we have one.
Dating a Casio anyway
The closest you get is the module’s introduction year: the watch can’t be older than its module. It is coarse, and the list of introduction years is not in anything we could read[2].
What we couldn’t verify
- A Casio serial with a known production date: no source gives one.
- Module introduction years: one site says it has them, but they are behind a form.
- A serial or date policy from Casio itself.
Casio modules with a page
63 modules have a page of ours with the battery, functions and manual; the most used first. Below, the examples from our sources.
- Casio module 3229DW-5600BB, DW-5600BBM, DW-5600BBMA…118 models
- Casio module 5146GA-110, GA-110A, GA-110AC…106 models
- Casio module 5611GA-2100, GA-2100, GA-2100AB25…91 models
- Casio module 3230DW-6900, DW-6900AC, DW6900ASSC23…73 models
- Casio module 5522GA-700, GA-700AR, GA-700BBR…55 models
- Casio module 5081GA-100, GA-100A, GA-100B…53 models
- Casio module 5230AWG-M100, AWG-M100A, AWG-M100B…48 models
- Casio module 3525DW-5600AI, DW-5600AKA, DW-5600BBR…47 models
- Casio module 3159GW-5000B, GW-5000HR, GW-5035A…34 models
- Casio module 4778AW-590, AW-590BL, AW-591…22 models
- Casio module 3410GW-4000SC, GW-9400, GW-9400BJ…22 models
- Casio module 5229GA-120, GA-120A, GA-120B…20 models
- Casio module 5444GAW-100, GAW-100AR, GAW-100B…19 models
- Casio module 5535GA-800, GA-800BL, GA-800BR…15 models
- Casio module 3298A140WE, A140WEG, A168WA…14 models
- Casio module 5398GA-400, GA-400A, GA-400BY…14 models
- Casio module 593A158WA, A158WEA, A158WEGV…13 models
- Casio module 5445GAS-100, GAS-100AR, GAS-100B…13 models
- Casio module 5544MTG-B1000, MTG-B1000B, MTG-B1000BD…13 models
- Casio module 3224F-108WH, F-108WHC, W-218H…11 models
- Casio module 3263GD-100, GD-100BW, GD-100GB…11 models
- Casio module 5154AQ-230A, AQ-230EBLT, AQ-230ECK…10 models
- Casio module 3194G-7900, G-7900A, G-7900MS…10 models
- Casio module 5590GA-2000, GA-2000BT, GA-2000E…9 models
- Casio module 5371GWN-1000, GWN-1000B, GWN-1000C…9 models
- Casio module 5612GA-140, GA-140AR, GA-140BMC…8 models
- Casio module 3208CA-506B, CA-506G, CA-53W…7 models
- Casio module 5554GBA-800, GBA-800AT, GBA-800DG…7 models
- Casio module 5476GG-1000, GG-1000BTN, GG-1000GB…7 models
- Casio module 3495GW-5000HS, GW-5000U, GW-M5610…7 models
- Casio module 5121GW-3000B, GW-3000BB, GW-3000BD…6 models
- Casio module 5240GW-A1000, GW-A1000A, GW-A1000D…6 models
- Casio module 5463GWG-1000, GWG-1000DC, GWG-1000GB…6 models
- Casio module 5208AMW-S850, AQ-S800W, AQ-S800WD…5 models
- Casio module 5441GA-1100, GA-1100GB, GA-1100KH…5 models
- Casio module 5641GBA-900, GBA-900CB, GBA-900RD…5 models
- Casio module 3506GBD-200, GBD-200LM, GBD-200RD…5 models
- Casio module 3464GBD-800, GBD-800LU, GBD-800SF…5 models
- Casio module 5479AEQ-100W, AEQ-110BW, AEQ-110W…4 models
- Casio module 2747AW-80, AW-80D, AW-80V…4 models
- Casio module 3232DW-9052, DW-9052, DW-9052GBX…4 models
- Casio module 5594GG-B100, GG-B100BA, GG-B100BTN…4 models
- Casio module 5713GWG-B1000, GWG-B1000EC, GWG-B1000MG…4 models
- Casio module 3405GW-M500A, GW-M500BA, GW-M500F…4 models
- Casio module 3191LA-11WB, LA-11WL, LA670WA…4 models
- Casio module 3284LA-20WH, LA-20WHS, LA680WEL…4 models
- Casio module 5369MTG-S1000BD, MTG-S1000D, MTG-S1000V…4 models
- Casio module 3198AE-1000W, AE-1000WD, AE-2100W3 models
- Casio module 3299AE-1200WH, AE-1200WHD, AE-1200WHUB3 models
- Casio module 3502AE-1500WH, AE-1500WHC, AE-1500WHX3 models
- Casio module 5711GA-2100AS, GA-2100NNJ, GA-2140RX3 models
- Casio module 3403GD-350, GD-350BR, GD-350GB3 models
- Casio module 3240W-800H, W-800HD, W-800HM3 models
- Casio module 5302GA-1000, GA-1000FC2 models
- Casio module 3157SGW-100, SGW-100B2 models
- Casio module 5161WVA-M630B, WVA-M640D2 models
- Casio module 4334EFA-120D1 model
- Casio module 5562GSG-1001 model
- Casio module 5565HDC-7001 model
- Casio module 5269SGW-500H1 model
- Casio module 3416W-735H1 model
- Casio module 3092W-800HG1 model
- Casio module 3239W-96H1 model
5611
from the source
The source says
no date. Module 5611 identifies the electronics; the manual for the GA-2100 setting instructions is found by searching the module number[2]
Our decoder says
Module 5611: 91 models, no date open it
3229
from the source
The source says
identifies the internal movement (3-4 digit module code); no date[2]
Our decoder says
Module 3229: 118 models, no date open it
593
from the source
The source says
identifies the internal movement (3-digit module); no date[2]
Our decoder says
Module 593: 13 models, no date open it
Questions
Does a Casio serial number tell the year?
No. Casio does not put a date code in its serials, and many Casio watches have no serial at all. One collector site reads some G-Shock serials like a Seiko date code; other sources disagree, and none checks it against a watch of known date, so we don’t decode it.
What is the module number on a Casio?
The 3–4 digit number in a small box on the case back: it names the electronics inside, and Casio files its manuals by it. Module 5611 is used by 91 models in Casio's own index; many models share one module.
How do I find the manual for my Casio?
Search Casio’s manual site by the module number. For module 5611 that is the 5611 user’s guide (PDF).
Which module is in the Casio F-91W?
F-91W uses module 593, according to Casio's own manual index.
More tools
- Seiko serial number lookupYear digit and month from the serial; the decade from the calibre.
- Bulova date codesA letter for the decade and a digit for the year, from 1950.
- Timex date code lookupDial codes of mechanical Timex, and the case-back codes from 1985.
- Watch serial number lookupWhat the serial of each brand can and can’t tell you.
Sources
Documents checked · Report a wrong number
- 1Majestix Collection — How to Check Casio Watch Serial Number Correctly · html · read
- 2Watch Identifier — Casio Watch Identifier: Module and Model Numbers Explained · html · read
- 3Serial-Number-Decoder.co.uk — Casio serial number decoder. Date a Casio by serial number, batch code or module · html · read
- 4Casio Computer Co., Ltd. — Watch manual search JSON (US locale), manual_search.support.json · json · read