Canuck
·Could be decent movement under the cover that given it's a solid gold case.
You want to get your thumbnail under the back cover ( curvette ) and see what magic is revealed.
Interesting that the case is stamped .625 (15 karat)! A German or Scandinavian made case? Likely contains a 15 or 17 jewel, 1899 model, 16-size movement.