Hi, I just inherited this Stowa, and would like to find out more about it. It says "Stowa 17 rubis antichoc" on the face, and the hours are in roman numerals. The back appears to be hand painted. It's been recently serviced, and is in full working condition. I only know that it's a German brand that's been around for 80+ years - I've no idea how old this watch is, or how rare it is. Any information would be appreciated, thanks!