My grandmother's round GRUEN Precision wristwatch is about 15mm diameter, has 16 - 17 tiny diamonds around the face and 3 larger ones by each band.
Silver colored triangles mark the hours and by the 6 it says SWISS. On the backit says 14K Gold. The gold colored band is stamped SPEIDEL 10K g.F. USA, Pat.Pend. and a small chain connects both ends. It has been packed away for a long time. Ehere can I find out more about tihs watch? Thank you for your help.