Specifications
- Reference
- 03.A3642.670/01.M3642
- Family
- DEFY
- Category
- Dive
- Status
- Current
- Case material
- Stainless steel
- Case diameter
- 37 mm
- Case thickness
- 13.6 mm Official
- Lug-to-lug
- —
- Lug width
- —
- Water resistance
- 300 m
- Bezel
- Rotating, diver
- Calibre
- Elite 670 Official
- Power reserve
- about 50 h
- Frequency
- 28,800 vph (4 Hz)
Official product page · retrieved October 18, 2026
Does it fit your wrist?
Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.
No lug-to-lug figure exists for this reference yet, so fit cannot be computed.
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 |
|---|---|---|---|
| 13.6 mm | Official | Zenith | October 18, 2026 |
Lug-to-lug
No source gave this figure yet.
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.
Calibre source
Official Zenith · retrieved October 18, 2026
Other DEFY references
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| DEFY Extreme Diver 95.9601.3620/51.I301 | 42.5 mm | 15.5 mm | — | El Primero 3620 |
| DEFY Skyline (steel, 36 mm) 03.9400.670/01.I001 | 36 mm | 10.35 mm | — | Elite 670 |
| DEFY Skyline (steel, 41 mm) 03.9300.3620/01.I001 | 41 mm | 11.6 mm | — | El Primero 3620 |
| DEFY Skyline Skeleton (steel) 03.9300.3620/78.I001 | 41 mm | 11.6 mm | — | El Primero 3620 |
| DEFY Skyline Skeleton (18 ct rose gold) 18.9300.3630/78.I001 | 41 mm | 12.2 mm | — | El Primero 3630 |
| DEFY Skyline Skeleton (ceramic) 49.9300.3620/07.I001 | 41 mm | 11.6 mm | — | El Primero 3620 |
| DEFY Skyline Chronograph (steel) 03.9500.3600/51.I001 | 42 mm | 12.7 mm | — | El Primero 3600 |
| DEFY Skyline Chronograph Skeleton 03.9500.3600/79.I001 | 42 mm | 12.7 mm | — | El Primero 3600 |
| DEFY Skyline Chronograph (ceramic) 49.9500.3600/21.I001 | 42 mm | 12.7 mm | — | El Primero 3600 |
| DEFY Extreme (carbon and titanium) 10.9102.9004/51.I200 | 45 mm | 15.4 mm | — | El Primero 9004 |
| DEFY Extreme (titanium) 97.9100.9004/80.I209 | 45 mm | 15.4 mm | — | El Primero 9004 |
Other Zenith models
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Chronomaster Solo Sport 03.5000.3620/21.M5000 | 40 mm | 13.13 mm | — | El Primero 3620 |
| Pilot Automatic (steel) 03.4000.3620/21.I001 | 40 mm | 12.85 mm | — | El Primero 3620 |
| Pilot Automatic (ceramic) 49.4000.3620/21.I001 | 40 mm | 12.85 mm | — | El Primero 3620 |
| Chronomaster Revival El Primero A384 03.A384.400/21.M384 | 37 mm | 12.6 mm | — | El Primero 400 |
| Chronomaster Original 03.3200.3600/22.C908 | 38 mm | 12.6 mm | — | El Primero 3600 |
| Chronomaster Original Triple Calendar 03.3400.3610/38.C911 | 38 mm | 14 mm | — | El Primero 3610 |
Show 9 more
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Chronomaster Open (steel) 03.3300.3604/21.M3300 | 39.5 mm | 13.6 mm | — | El Primero 3604 |
| Chronomaster Open (18 ct rose gold) 18.3300.3604/69.C922 | 39.5 mm | 13.6 mm | — | El Primero 3604 |
| Chronomaster Sport (steel) 03.3100.3600/21.M3100 | 41 mm | 13.6 mm | — | El Primero 3600 |
| Chronomaster Sport (18 ct rose gold) 18.3130.3600/01.R951 | 41 mm | 13.6 mm | — | El Primero 3600 |
| Chronomaster Sport (steel and rose gold) 51.3102.3600/01.M3100 | 41 mm | 13.6 mm | — | El Primero 3600 |
| Pilot Big Date Flyback (steel) 03.4000.3652/21.I001 | 42.5 mm | 14.25 mm | — | El Primero 3652 |
| G.F.J. (18 ct yellow gold) 30.1865.0135/56.C216 | 39 mm | 10.5 mm | — | Calibre 135 |
| G.F.J. (platinum) 40.1865-2.0135/01.C220 | 39 mm | 10.5 mm | — | Calibre 135 |
| Pilot Big Date Flyback (ceramic) 49.4000.3652/21.I001 | 42.5 mm | 14.25 mm | — | El Primero 3652 |