I've tried the search function, but could not answer this question: Were the Interarms PPK/s' marked in any way to indicate year of manufacture? I have a blued PPK/s with s/n 0690xx. There is a proof mark on the chamber, visible through the ejection port, that looks like the letters VA attached to each other. Other than the "normal" imprints on the slide, I can't find anything else to indicate birth date. Can anyone help me?? Thanks!!