This vintage relatively rare 1960s Hamilton M75-1 watch is the ultimate classic timepiece. It features a 33 mm round gold-plated stainless steel case with a solid gold bezel, which elegantly displays the silver analog dial with gold applied arrow markers and 17 jewels. The mechanical manual wind movement is powered by a Cal 688 movement and features a 12-hour dial and seconds hand. I cannot open case as it is one piece.  Based on research and inquiries it appears this has the 17 jewel 688 movement that is running at time of listing.  http://www.hamiltonchronicles.com/2017/01/1964-m-69-3.html  (the M75-1 is likely the gold version)