Hi guys, From Pascal S I found out this was originally made in small numbers as a manual wind chronograph with a Lemania 1873, afterwards the U-Boot then switched to the automatic calibre 5100 and was produced in limited numbers for several years. It evolved into various versions, mostly differing in their dial and bezel configuration, this one having a neat coke glossy dial. Some details about it: Movement: Swiss Lemania calibre 5100 automatic chronograph movement Case: Polished and brushed stainless steel case, solid 18K gold rotating rider on the bezel Dimensions: 40.2 mm in diameter without the crown or pushers, 15.6 mm thick Caseback: Screw-in, steel Crown: Screw-down gold crown Dial: Deep glossy coke dial with gold sub-dials surrounded by a tachy chapter ring Strap: genuine alligator strap which suits it quite nicely It underwent a full service a couple of months ago at a very good watchmaker. It's running great and the service papers will be provided. If you would want higher resolution pics, just drop me a pm. I've taken pics from several angles to best show this good looking dial, please excuse the dust particles on the outside of the glass. My asking price is 1,250$ net to me (or the equivalent in Euros). I have a couple positive reviews here as a seller, and I have been buying/ selling/ trading watches for several years now to fellow watch enthusiasts from all across the globe ( US, Canada, Australia, Netherlands, Croatia, Austria, UK, Turkey, Cyprus, Norway etc just to name a few) and everything went really well (including customs ). More than glad to provide extra references upon request. https://omegaforums.net/threads/george-a-is-a-fantastic-seller.58548/ https://omegaforums.net/threads/george-a-is-a-fantastic-seller.48783/ https://omegaforums.net/threads/george-a-great-seller.48553/ https://omegaforums.net/threads/george-a-is-a-great-seller.46757/ https://omegaforums.net/threads/george-a-is-a-great-seller.44925/ https://omegaforums.net/threads/it-was-a-pleasure-to-deal-with-cristos71.38388/#post-443699 https://omegaforums.net/threads/heavens-just-a-sinn-away-thanks-to-george-a.37951/ https://omegaforums.net/threads/put-your-trust-in-george-a.36828/ https://omegaforums.net/threads/thank-you-george-a.33519/ https://omegaforums.net/threads/great-doing-business-with-gunsmoke375.31181/#post-354444 https://omegaforums.net/threads/kyle-l-is-a-top-notch-guy.29102/ https://omegaforums.net/threads/george-a-a-great-introduction-to-omegaforums.24498/ https://omegaforums.net/threads/george-a-excellent-seller.19394/ https://omegaforums.net/threads/george-a-great-seller.25812/ Thanks for looking, George