So I rescued an abused and forgotten 4506-1 from a local Pawn Shop. Long story short, after cleaning her up and repairing her I decided to look up her serial number. I have both the 3rd and 4th editions of the S&W Supica Books (I contributed to the 4th) and cannot find the date range for this one. I thought most should be in the TXXNNNN range but this one has a serial of KJF7XXX. Any one have a date for it?