Very rare and spectacular Olma Caravelle 200 Super Compressor from the 1960s. A true professional diver that has had incredible worldwide fame, especially in the collectibles sector dedicated to technical diving instruments. 36.5 x 39.8 mm steel case with two patents made for Olma by Ervin Piqueret (epsa) the inventor of the Super Compressor system. Basically, the Swiss engineer fitted the casebacks with a special spring that increased the watertightness of the watch as a function of depth. A true revolution for the time. Original crowns: at h 2:00 turns the inner bezel for calculating dive times; at h 4:00 that for the main adjustment of the watch. Black dial with steel tritiated hour markers, red 20-minute decompression scale. Original tritium-coated spheres set and seconds in red. Movement as 1903 automatic in perfect working order. Recently overhauled. New rubber diving strap with red stitching.