ONSA is a Swiss brand, founded 1923 by Hans Gilomen, in Lengnau. When the Mayflower II made its legendary Atlantic crossing, there had been two ONSA watches on the ship, type Automatic-Waterproof, to be tested. Believe it or not, one of them hung on the top of the mast, withstanding the forces of nature, wind and weather. But the other one really went through the test. It was UNDER WATER, attached to the rudder of the sailing ship. When Hannes Keller, an extreme athlete, was diving down into the Lago Maggiore (the great/maggiore lake) in the year 1960, to a new world record depth, he had a ONSA watch on his wrist, the ‘Scaphandrier’ (French word for diver). He and the watch came up again from 155 meters depth and both, diver and watch, were unharmed. -Manufacturer: Onsa -Model: Automatic Date -Movement: Swiss A. Schild Caliber 1902 Features 17/21/25 jewels automatic sweep second f = 21600 A/h power reserve 44h -Material: Steel based gold plated -Crystal: Mica, no scratch -Waterproof: Yes (Not Tested.) -Size/diameter: 34mm without the crown x40 mm -Band/bracelet: Genuine leather unworn leather strap with gold plated buckle. Condition: case 9/10 - dial 9/10. No scratch on the glass and the dial. Please study the photos for further description. There are more than 30 photos and the main part of the description. Working: Watch in working nice and smooth condition. -Watch comes with generic or other brands watch box as a gift for additional protection. -We pack well and ship it tracked and insured via express couriers. -Please study the import duties and customs regulations of your country. All kind of customs duty to be paid is buyers additional responsibility. -Do not forget to check out our other auctions, please.