Wittnauer automatic w/open framework case
All yellow gold filled case measures 38mm long lug to lug, by 29mm wide, not including crown. Case showing noticeable brass on bezel's high spots. Good original silvered dial. Recessed crown. 17 jewel automatic movement winds, sets, and runs to within 2 min/day or better, but not know when last serviced. Used but nice 18mm peanut brown leather band. Longines shares this case design with Wittnauer, but I believe the Longines version was only available with a manual wind movement.