La Cote des Montres : Enchères Sorna Watch, Grenchen, Ref. 2692. Produced in the 1970's. World Time, water-resistant, "tonneau bombé", stainless steel gentleman's wristwatch with date, round button chronograph, register, tachometerand telemeter.
Quick Closeup - the Sorna "worldtimer" sports watch - YouTube
Sorna Bullhead Chronograph Easy Rider (very rare) for $977 for sale from a Seller on Chrono24
Sold at Auction: Sorna Chrono Bullhead wristwatch -Chronograph with 15-minute counter and date,
WTS] Sorna Bullhead Close to NOS Automatic Watch $199 Shipped : r/Watchexchange