I just picked up this rare Ulysse Nardin Deck Watch Cir. 1930 with a cabler M 70 m/m ,Three quarter plate gilt movement with Earnshaw's spring detent escarpment, compensated cut bi-metallic balance with blue steel spring regulator, fully jeweled to the center arbor. They later made pocket watch deck watch with out the detent that the Russians after WW2 copied and you see a lot on eBay. Only saw 2 others on the net not many. This came out of Commander William R. Bricker collection who passed away in 2001 would of loved to meet him and talk military watches. About his collection a good read. https://nawcc.org/images/stories/publications/military_timepieces1.pdf https://nawcc.org/images/stories/publications/military_timepieces2.pdf The chronometer I got in this booklet. Auction of his collection https://www.willishenryauctions.com...-timepieces-collection-auction-march-18-2017/ Here is a mint one for sale I got mine a lot cheaper but like the History of it better since it was once owned by a well known collector. https://www.sellingantiques.co.uk/5...ck-watch-chronometer-by-ulysse-nardin-c1937/# Bricker Dad and him collected military watches that I could only dream of glad to own just one. This has a Kriegsmarine mark that was put on way before they were done as fake to make more money so it's sort of a mystery if real thread from the MWR forum. https://www.mwrforum.net/forums/sho...deck-watch&s=6c4f5c45272eec0a507f7b7d76abe82d Still a valuable watch even if the mark not right but I had a RAF dated 1940 Waltham wristwatch in a Denison case with Waltham 870 movement MWR called fake and a member came up with the RAF specs for my watch legit after all. A few told me never say never. A watchmaker I was thinking of servicing this since he did my Hamilton model 21 chronometer went crazy over said I did well and I would get my money back he said sell it at a auction house he named a few he said skip eBay were I got it. It's in running condition will run for 56 hours on one wind. The key to open the lower part to were you wind it and the other key to change the time you put that in the center of the hands. The movement. I think this has been sold a few times since Bricker passed away he was a WW2 Navy Pilot and probably were in some of the battles in the pacific my Dad was. The watch maker said this was as rare as the first chronometer pocket watch he got excited over it I must of done good on this purchase. The funny thing this was running when I open it after getting it in the mail it came from New York City. I love these old navigation watches when it took some brain power instead of cheating with GPS.