I've only seen a few of the Jaeger LeCoultre Geomatic. Finally was able to pick one up last month. Case wears/looks larger than 36mm due to having large dial and practically no bezel. The factory original JLC 23-jewel caliber K881G chronometer with autowind movement is adjusted to 5 positions & temperature. These movements received a COSC rating for "especially good results" after 360 hours (15 days) of rigorous testing.Fast-beat - 19,800 vibrations/h, calendar with instantaneous date change at midnight, direct drive seconds with "hack" seconds stopping device for synchronizing watch to the second. Kif shock protection. According to LeCoultre archives only 1700 of these were made from early 60's to late 60's. LeCoultre made very few chronometre grade movements, while Rolex and Omega made over 100,000 during this period.