A rare vintage Nivada Grenchen Chronomaster "Orange Boy" Aviator Sea Diver watch circa 1965

Valjoux 23 movement - Factory signed movement

Ref. 85004-3730

Size: 38 / 40 mm

Made in 1965 as the worlds first "super function" watch for aviation, scuba dicing, car racing, and yachting regattas.

The watch is 100% original

Beautiful dial in stunning condition.

Chrome case with minor blemishes and marks

You can judge the condition of the watch by the attached photos

The photos are taken in macro mode

The mechanism works very well, also the chronograph

It has been checked by my watchmaker and serviced in November 2025

All the necessary work has been done.

The watch is a beautiful addition to any collection and is an extremely sought after variation due to the rare inclusion of a 5 minute regatta countdown timer.

The strap in the photos is an original strap with the manufacturer's logo, included with the watch.