While visiting the local flea market I stumbled apon a very dirty 1940 Buren. Thinking this could be a flipper on Ebay whether it worked or not I offered the guy a dollar and he took it. I started to fiddle with it while still walking around and imagine my surprise when the second hand started to move. I took her home and opened the case to find the movement encased in another inner case. Getting that apart, after some Google searching, I cleaned the grime off the crystal and case and the results are below. the movement said 17 jewel unadjusted and the inside of the case had FOND ACIFER, INOXYDABLE along with BRUEN W. CO, SWISS. I think it is a keeper so I need a good band for it. Any suggetions would be appreciated.