credit: moonwatchonly.com from the book Chronomaster only Yes, they are rare, less then 20 pieces are known till now. Inside works always a Valjoux 23. […]
credit: subsea57 Some hard to find and nice ones are here to see - LeJour Croisiere SUPER two times!, the Yema Yachtingraf Croisiere, the rare Nivada Grenchen Yachting, Thermidor "Yachtingraf"-Lookalike, very nice Skippper 73464 and the rare 1564 Skipper and two nice ones with Regatta dial and knots inner bezel. And a Monnat ;) But these are not the only ones... More to see in the Collections section here.
In the 60s and 70s were produced loads of watches for multipurposes - including colored segments on the right subdial for showing 5/10/15 minutes which are necessairy to use the watch for a regatta start. Which brands did yachtings and regatta watches? A LOT! Read here a little post about these watches. But - it´s just a start... ;)