Just had this brought to me . It requires replacement of the little double suspension spring. I was able to locate a replacement but am a bit stumped as to the age or origin . I am guessing it is french bur can fin no markings except for a stamped # on the back of the movement...I have viewed ,probably several hundred photos and nothing I find has a dial or movement that looks anything like it. It's heavy as a boat anchor . Has anyone sen one with a front like this before?