I have an old Wittnauer Geneve Automatic that I would like to know more about. I am new here and don't know how to post a pic. Cannot remove the back to look at numbers. My brother tried to remove it and scratched it up. What I can make out is "use all proof wrench 1075" and the rest is scratched up except for the "stainless steel back." It appears to be 10k gold filled maybe, I don't know. Any help?