Welcome to my Top Swiss Chronometers Boutique: Montres Tudor SA, or simply Tudor, is a Swiss watchmaker based in Geneva, Switzerland. Registered in 1926 by Hans Wilsdorf, founder of Rolex, the brand remains a sister company to Rolex; both companies are owned by the Hans Wilsdorf Foundation. Tudor was initially known for watches produced for the military and professional divers. From the 1960s to 1980s, several navies issued Tudor Submariners to their divers, including the US Navy SEALs and the French Marine Nationale. The Tudor trademark was registered in 1926 by Swiss watchmaking company Veuve de Philippe Hüther on behalf of Hans Wilsdorf, founder of Rolex watches. In 1936, Wilsdorf took it over and went on to found the company Montres Tudor SA in 1946. Tudor's purpose was to offer a more affordable watch than Rolex while maintaining Rolex-like quality. Tudor watches were originally equipped with off-the-shelf movements paired with Rolex cases and bracelets, allowing Tudor to provide reliability and quality while achieving its price goals. Tudor debuted its Oyster collection in the mid-forties, featuring a waterproof Oyster case previously exclusive to Rolex. In 1952, Tudor released its first self-winding model, the Prince, which used a Rolex self-winding mechanism. Twenty-six Tudor Oyster Princes were included in the British North Greenland expedition of 1952–1954. The adoption of the Oyster case and self-winding rotor facilitated Tudor's move into the production of tool watches. The French Navy was involved in field research for a Tudor diving watch; from the 1960s to the mid-1980s, Tudor tool watches were supplied to the French Navy in bulk without bracelets so military-issued straps could be used instead. Tudor launched its first diving watch in 1954, the Oyster Prince Submariner, waterproof to 100 metres, which increased to 200 metres in 1958. Over the years the Submariner line adopted various features such as the "big crown" and "snowflake hands" (which have been reintroduced in for Tudor's current catalogue). In 1964, Tudor began producing an Oyster Prince Submariner specifically for the US Navy. 1957 saw the launch of the Tudor Advisor, which incorporated an alarm complication, the first Oyster model to amplify sound. Later in 1969 this was changed to a more ‘traditional’ alarm case with an external case back to increase its volume. In 1970, Tudor released its first chronograph, the Oysterdate, with a manually wound Valjoux mechanical calibre 7734 and cam chronograph function. The second series, introduced in 1971, was nicknamed "Montecarlo" because its dial resembles a roulette wheel. The third series, Oysterdate "Big Block", debuted in 1976, was the first Tudor chronograph to introduce a self-winding movement. The Tudor Monarch collection launched in 1991 and the Tudor Hydronaut in 1999. Movement: - manufacture MT5612 self winding caliber - certified C.O.S.C. chronometer - 26 jewels - 70 hours power reserve - vibrations: 28.800A/h, 4 Hz - bidirectional automatic winding - instantaneous quick-set date - hacking seconds - full traversing balance bridge - free-sprung, variable-inertia balance - silicon hairspring Case: - 316L stainless-steel - polished/fine brushed - 41mm excl. crown, 45mm incl. - 14,6mm thick - length: 50,3mm lug to lug Glass: - sapphire crystal - anti-reflective coating Crown: - 316L polished stainless-steel - push/pull - screwed down - chic engraving Case back: - 316L solid stainless-steel - with engravings Bezel: - 316L stainless-steel, fine brushed - unidirectional turning - diver's 0 - 60 - fluted Dial: - black matte - luminescent polished hands and hour batons - date aperture at 03:00 o'clock - central seconds hand - minute markers around the outer rim - perfect readability and clarity Bracelet: - authentic Tudor - 316L stainless-steel, fine brushed - length: ca. 19,5cm - width: 21,5mm by lugs, 18mm by clasp Clasp: - original Tudor, very special construction - 316L stainless steel - with Tudor logo Weight: 175 grams Chic watch box. Water-resistant: 20ATM/200meters/660feet: a real diver! Highly recognizable for connoisseurs of haute horlogerie. Exceptionally distinctive design. Excellent condition, never worn: the wristwatch comes from luxury watch-shop showcase. My personal authenticity and quality warranty: you will get warranty card (as pictured), fully completed, stamped and signed. General professional pre-sale service was made in July 2026: the watch is keeping good time and working perfectly. Insured, registered shipping worldwide with Intl. Express service: it’s not cheap, and yet fast and reliable, two days in Europe, three days for the rest of this world. What you see in my pics is what you get. These are my own photos of the actual watch up for auction. NO EXTRA COSTS for EU Buyers!