Hello all. Found a Steyr M1912 I have my eye on. But it has some things that are different about it. The slide and frame match. It has all the stamps in the right place, 1917 Steyr on the slide. What is different is the Wn-18 stamp and the 5 digit serial number. It isn't a letter disguised as a number it is a 10XXX number that match's. What is the story? Most I've seen have letters and the Wn-# match's the year. Was this an odd contract? Thanks! Carl.