Hello boys and girls. I've recently developed an interest in the L/M/C/S9-A1 pistols and have been doing a wee bit of research about them. In the process, it occurred to me that I don't know much about the GB that has been sitting in my safe since circa 1993. Hell, I don't even know when it was made! The ID on this tack driver is P 06xxx && X182 (where &=a proof mark). Can I assume that this unit was manufactured in January 1982? Thanks in advance!