The symbol appears to me to be a 10. That would stand for the gold plating on the case which is probably 10 microns, or 10 millions of a meter. Plating of 20 to 40 microns would be more typical on better quality watch cases. If you take the watch to an actual watchmaker, take his advice as to the wisdom of spending any money on it. The shop would know about pins and a strap.
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