Specifications
- Reference
- F-91W-1
- Family
- Casio Collection
- Category
- Tool
- Status
- Current
- Case material
- Resin
- Case diameter
- 35.2 mm
- Case thickness
- 8.5 mm Official
- Lug-to-lug
- 38.2 mm Official
- Lug width
- —
- Water resistance
- —
- Bezel
- —
- Calibre
- Quartz · calibre not named by the brand
Official product page · retrieved October 15, 2026
Does it fit your wrist?
Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.
Looks small
Lug-to-lug 38.2 mm on a flat top of 54.1 mm: 71 % of the width.
Lug-to-lug is under 75% of the flat top. Fine to wear, but the watch may look small on you.
Measurements and sources
Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.
Case thickness
| Value | Type | Source | Date |
|---|---|---|---|
| 8.5 mm | Official | Casio | October 15, 2026 |
Lug-to-lug
| Value | Type | Source | Date |
|---|---|---|---|
| 38.2 mm | Official | Casio The brand publishes the case length (38.2 mm x 35.2 mm, length x width); the width is the size across. | October 15, 2026 |
Lug width
Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.
No source gave this figure yet.
Other Casio models
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| G-Shock DW-5600 DW-5600UE-1 | 42.8 mm | 13.4 mm | 48.9 mm | — |
| G-Shock GA-2100 GA-2100-1A1 | 45.4 mm | 11.8 mm | 48.5 mm | — |