Zenith
Zenith Defy Revival A3691 03.A3642.670/3691.M3642
The Zenith Defy Revival A3691 (reference 03.A3642.670/3691.M3642) is a 37 mm stainless steel watch. It runs on the automatic caliber Elite 670 with a 50-hour power reserve and is water resistant to 600 m.
Specifications
Case
- Reference
- 03.A3642.670/3691.M3642
- Collection
- Defy
- Case size
- 37 mm
- Case material
- Stainless steel
- Case shape
- Other
- Crystal
- Sapphire
- Water resistance
- 600 m
- Bracelet / strap
- Stainless steel ladder bracelet
Dial and bezel
- Bezel
- Fixed, 14-sided
Movement
- Movement
- Automatic
- Caliber
- Elite 670
- Power reserve
- 50 hours
- Frequency
- 28,800 vph
- Jewels
- 27
- Functions
- Date
Production
- Production
- Current
How it compares within the Defy family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 03.A3642.670/3691.M3642 (This watch) | 37 mm | Stainless steel | — | Elite 670 | — |
| 03.A3642.670/75.M3642 | 37 mm | Stainless steel | — | Elite 670 | 2022– |
| 95.9000.670/78.M9000 | 41 mm | Titanium | Skeleton | Elite 670 SK | 2018– |
| 95.9000.9004/78.M9000 | 44 mm | Titanium | Skeleton | El Primero 9004 | 2017– |
About the Defy family
Defy is a Zenith name that dates back to 1969, when it was used for a robust watch with an octagonal case. Today it covers Zenith's contemporary family, with sub-lines such as Defy Classic, Defy Skyline, Defy Extreme and the high-frequency El Primero 21. This heading holds Defy references outside those sub-lines.
The catalog includes steel and titanium references with calibers such as the Elite 670 and El Primero 9004, including reissues of the 1969 case. Dealers identify the model from the reference and check the strap or bracelet.
Quick answers
- What size is the Zenith Defy Revival A3691 03.A3642.670/3691.M3642?
- The Zenith Defy Revival A3691 03.A3642.670/3691.M3642 has a 37 mm case.
- What movement does the Zenith Defy Revival A3691 03.A3642.670/3691.M3642 use?
- It uses the automatic caliber Elite 670, with a 50-hour power reserve.
- How water resistant is the Zenith Defy Revival A3691 03.A3642.670/3691.M3642?
- It is water resistant to 600 metres.
- Is the Zenith Defy Revival A3691 03.A3642.670/3691.M3642 still in production?
- Yes, it is a current reference.
- What is the Zenith Defy Revival A3691 03.A3642.670/3691.M3642 made of?
- The case is stainless steel. Bracelet or strap: Stainless steel ladder bracelet.
Catalog facts checked September 2026.