At a gunshow today, there seemed to be a lot of P-64s for sale compared to other surplus handguns. Since I already have two (1967 and 1975 dated), I did not inspect any real closely since many were in wooden crates standing upright. Some that were lying flat on tables mostly had late 1960s dates causing me to ask: what are the earliest and latest dated P-64s out there to be found? Not sure when the P-64 mfg was halted but at least the designation "64" would be when the gun was designed. So from 1964 through (fill in blank). What are your observations?