this is an extremely rare jaeger lecoultre master mariner (reference 24001.21) from 1974 in 18k yellowgold, coming with an extract of the jlc archives. the 37mm steel automatic chronometer is a very interesting watch in a historical kind of way. it came out in 1973, the exact same year the ap royal oak 5402 hit the market, and even three years before the patek philippe nautilus 3700 was released in 1976. it´s a obvious design template in our opinion. while the royal oak and the nautilus have become outstandingly succesfull icons of their brands, only a small minority of collectors is even aware of the existance of the jlc reference 24001 today. if you look closer at the watch, there are so many design similarities to the famous brothers, like for example the stepped dial (nautilus) or the two sharp edges on the case sides (royal oak). it´s also a fact that both movements of the original nautilus and royal oak where refined jaeger lecoultre 920 calibers, so there was always a strong connection between those brands. the production of the jlc 24001 ended after only two years, in 1975, as an unsuccessful victim of the quartz-crisis. the master mariner is powered by the jlc 906 chronometer caliber,the same one which was also used in the vacheron constantin royal chronometer. It has just received a full service by our watchmaker and will run perfectly for many years. The watch comes on a new customized leatherband with golden jlc buckle.