Wittnauer AllProof
Introduced 1918; produced in various case styles into the 1940s. Widely cited as one of the earliest wristwatches marketed as simultaneously waterproof, shockproof, and antimagnetic.
2 references
| Reference | Variant | Years | Dial | Size |
|---|---|---|---|---|
| AllProof (Staybrite/Gallet case) | Jimmie Mattern-era AllProof, c. 1933 | 1930–1936 | silver | 28 mm |
| AllProof Contracid Cal. 56 | WWII-era Contracid stainless steel | 1939–1945 | Not recorded | Not recorded |