I possess a rare collector's piece, diver's wristwatch, 300 m, Jacques COUSTEAU model, ocean depths, automatic, 25 rubies, incabloc This watch dates from 1960. It was used by the French navy and the special forces marine fire-fighters in Marseille. It's one of the watches Jacques COUSTEAU wore on his wrist when diving. It won a prize at the Besancon luxury watchmaking fair in 1968. The dial and crystal are worn but the writing on them is perfectly preserved. Its original bracelet is also beautifully worn with age and use. Also the original crown Automatic movement As mechanical, 25 rubies, calibre PUW 1463 F=18000 A/h, power reserve 39 hours Case material: stainless steel Case size: case 38 mm, 40 mm with the crown at 4 o'clock It works perfectly. Water resistance was not tested because of the watch's value. It keeps time well. The date feature shows the day and date. Serial number 01529, patented SGDG, registered design The bracelet is adjustable and the maximum is around 20 cm in diameter.