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Casio watch · digital module

Casio GBD-200 manual and battery (CR2032)

Casio's operation guide for the Casio GBD-200 is the PDF for module 3506: Casio operation guide 3506 (PDF) ↗. It takes a CR2032 battery. The case is 45.9 mm wide, 48.4 mm long (case length L, not lug to lug), and 15 mm thick. It takes a CR2032 battery.

Sources checked · How we source numbers
Width (W)
45.9 mm1
Case length (L)
48.4 mm1
not lug to lug
Thickness
15 mm1
Lug width
not published by Casio
Casio GBD-200: size drawingCasio GBD-200, rect case, top and side view to scale: case width 45.9 mm, case length (Casio L) 48.4 mm, lug width — (unknown), thickness 15 mm. Bezel, dial and crown size are schematic.lug width —width 45.9case length (Casio L) 48.4TOPthickness 15SIDE
Casio GBD-200, top and side, to scaleDrawing from data, not a photo · mm

Module: Casio module 3506

The Casio GBD-200 runs on the Casio module 3506, a digital module.

Power source
battery2
Battery life
2 years2
Accuracy
±15 s/month2
Light
LED backlight (Auto Light, Super Illuminator, afterglow, selectable illumination duration)2

Battery

Module 3506 twins

Casio's manual list puts 5 model codes on this module: same functions, same manual, often the same battery.

Codes of the Casio GBD-200 family[3]GBD-200, GBD-200LM, GBD-200RD, GBD-200SM, GBD-200UU

Casio module 3506: functions, battery and manual

Casio GBD-200 specifications

Case width (W)
45.9 mm1
Lug to lug
not published by Casio; see case length (L)
Case length (L)
48.4 mm1Casio's L of L × W × H, measured differently from lug to lug; we never swap one for the other.
Thickness (H)
15 mm1
Lug width
not published by Casio
Weight
58 g1
Crystal
Mineral Glass1
Water resistance
200 m1
Module
Casio module 35063 · digital moduleCasio module 3506 specs
Battery
Accuracy
±15 s/month1
Years made
start not published
Case code
not used by Casio: the module number (module 3506) identifies the watch
Band fits
145–215 mm wrist1

On your wrist

The verdict compares the case length (L) with the flat top of your wrist. Balanced from ~17 cm, past the edges below ~15.5 cm.

= 6.7 in

Balanced on a 17 cm wrist: the 48.4 mm case length (L) covers 88% of an estimated 54.8 mm flat top.

Casio publishes no lug-to-lug for this model, so the verdict uses its case length (L). The strap or bracelet joins inside that length, which makes this a cautious estimate.

Casio cuts the band for wrists of 14.5–21.5 cm: your wrist is inside that range.

Flat top = circumference ÷ 3.1, a community convention, not a measurement of your arm. Compact ≤ 0.75 of the flat top, balanced ≤ 0.89, at the edge ≤ 1. Compare more watches in the watch size calculator.

Casio GBD-200: wrist fitCasio GBD-200 on a wrist, top view to scale. case length (Casio L) 48.4 mm. Wrist 170 mm, estimated flat width 54.8 mm (circumference / 3.1). Ratio 0.88: balanced.wrist, flat topwrist flat ≈ 54.8case length (Casio L) 48.4Balanced · 48.4 / 54.8 = 0.88estimate: wrist 170 / 3.1 = 54.8 flatcompactbalancededgeoverhang0.750.891
Casio GBD-200 on a 17 cm wristDrawing from data, not a photo · mm

Actual size on your screen

Calibrate once with a bank card and the drawing shows the Casio GBD-200 at 1:1, next to a millimetre ruler.

1:1 · not calibrated: sizes are approximate
Casio GBD-200: size drawingCasio GBD-200, rect case, top and side view to scale: case width 45.9 mm, case length (Casio L) 48.4 mm, lug width — (unknown), thickness 15 mm. Bezel, dial and crown size are schematic.lug width —width 45.9case length (Casio L) 48.4TOPthickness 15SIDE
Drawing from data, not a photo · mm
01020304050

Casio GBD-200 strap size

Casio publishes no lug width for the Casio GBD-200; its band is cut for wrists of 145–215 mm wrist1. Measure between the lugs with a caliper before buying a third-party strap.

Attachment: not published in our sources.

Find your strap length in the watch strap size tool, with the Casio GBD-200 filled in.

Same size as the Casio GBD-200

The models nearest to the Casio GBD-200 in case width and case length (L), drawn over it to scale; below, every model within 1 mm of its 48.4 mm.

Size comparison: Casio GBD-200, Casio GA-2100, Casio AQW-101, Casio AE-1000WTop-view outlines to scale on one centre. A Casio GBD-200: W 45.9, L 48.4, lug —, T 15. B Casio GA-2100: W 45.4, L 48.5, lug 16, T 11.8 (vs A: W −0.5 L +0.1 T −3.2). C Casio AQW-101: Ø 46, L 49.1, lug —, T 14.9 (vs A: W +0.1 L +0.7 T −0.1). D Casio AE-1000W: W 45, L 48.2, lug —, T 13.8 (vs A: W −0.9 L −0.2 T −1.2).D W 45B W 45.4A W 45.9C Ø 46D L 48.2A L 48.4B L 48.5C L 49.1A Casio GBD-200W 45.9 · L 48.4 · lug — · T 15B Casio GA-2100W 45.4 · L 48.5 · lug 16 · T 11.8vs A: W −0.5 L +0.1 T −3.2C Casio AQW-101Ø 46 · L 49.1 · lug — · T 14.9vs A: W +0.1 L +0.7 T −0.1D Casio AE-1000WW 45 · L 48.2 · lug — · T 13.8vs A: W −0.9 L −0.2 T −1.2
A Casio GBD-200 and the 3 nearest in size, on one centre, to scaleDrawing from data, not a photo · mm

Nearest in size

  1. ACasio GBD-200this watch
  2. BCasio GA-2100W −0.5 · L +0.1 · T −3.2 mm
  3. CCasio AQW-101W +0.1 · L +0.7 · T −0.1 mm
  4. DCasio AE-1000WW −0.9 · L −0.2 · T −1.2 mm

Differences against A in mm: W case width, L Casio case length, T thickness. Nearest by width and length together, from the published sizes.

Casio GBD-200 questions

Where is the manual for the Casio GBD-200?

The Casio GBD-200 runs Casio module 3506, and Casio publishes the operation guide for that module as a PDF: Casio operation guide 3506. The module number is stamped on the case back. All of the module’s models and its battery are on its page.

What battery does the Casio GBD-200 take?

The Casio GBD-200 takes CR2032, rated about 2 years.

How big is the Casio GBD-200?

The Casio GBD-200 measures 45.9 mm wide, 48.4 mm long (Casio's L, not lug to lug), 15 mm thick, 58 g.

Will the Casio GBD-200 fit a 7-inch wrist?

Balanced: the Casio GBD-200's 48.4 mm case length (L) takes 84% of the ~57.4 mm flat top of a 7-inch (17.8 cm) wrist. By the same estimate (circumference ÷ 3.1) it sits balanced from about 17 cm and overhangs the flat top on wrists under about 15.5 cm.

What module is in the Casio GBD-200?

The Casio GBD-200 runs on the Casio module 3506, a digital module. Casio's manual list puts 5 model codes on this module, 5 of them GBD-200 codes.

What strap size does the Casio GBD-200 take?

Casio does not publish the lug width for the Casio GBD-200. What Casio does publish is a band size: wrists of 14.5–21.5 cm, the wrist circumference its own band is cut for. That is a wrist range, not a strap width, so measure between the lugs with a caliper before you buy a third-party strap.

Find the strap length for your wrist and the Casio GBD-200 in the watch strap size tool.

More Casio watches

Sources

Documents checked · Report a wrong number

  1. 1Casio America — GBD200-1 | Digital Men's Watch G-SHOCK | CASIO (product page) · html · read
  2. 2Casio Computer Co., Ltd. — Watch Operation Guide 3506 (qw3506_EN.pdf) · pdf · read
  3. 3Casio Computer Co., Ltd. — Watch manual search JSON (US locale), manual_search.support.json · json · read