The Breitling Watch Source Forums

http://www.ebay.fr/itm/Vintage-SINN-903 ... 3a8fed31f9

Helmut Sinn was a pilot and issued his first watches in 1961. Circa end of 1977 -early 1978 he bought from Willy Breitling some license rights about the Navitimer design and principles. He furtherly bought parts from Olech and Wajs + 400 to 500 8806-8808 cases from J. Zurbuchen and P. Wijs. He modified them to fit the manual 7740 initialy and furtherly Valjoux 7736 and 7750 . Nothing clear about the number of Sinn 903 derivated from the Navitimer 7806 . This one looks like a part of the 1st batch . See the Sinn engraved chrono bridge and Breitling 7806 casing. Interesting version even if it had a life !

Very interesting. Glad to say later 903 don't look much like this, although there are still swage lines through the case that are reminiscent. Thank you for sharing.

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Jim

"You have Control".