In the early 60s advertisements read “The Chronomaster is a Super-Chronograph” and “The Croton Nivada Grenchen CHRONOMASTER is a favorite with sports car drivers, airline pilots, skin divers, yacht race enthusiasts, engineers, navigators, scientists, business executives, and a host of others.” Brand: Croton Model: Chronomaster Aviator Sea Diver Reference: 105-9870 Movement: Valjoux 92 Case: Stainless steel Size: 38mm Year: 1960s Strap: Leather Box/papers: No Los Angeles $2,800 plus shipping or best offer CONDITION & SERVICING -The dial is in good condition showing a few marks. -The case is in very good condition not showing any notable damage. -Hands and markers are in good condition, both showing matching lume patina.  -Service history is unknown. TIMESTAMP [https://imgur.com/a/9GuPUqH](https://imgur.com/a/9GuPUqH)