How old is my Trracer?

[donkeyman]

Well firstly this is my first post on the forum so hello everyone. I've posted a fair number of reviews though and secondly does anyone know how to date a PMI Trracer? Mine is not a Tagmaster and is the original Trracer. The serial number is 000757 and I bought it used and it looks brand-spankin' new! What kinds of changes did they make to the original design over time. I've tried looking into it but the answers have all been somewhat foggy. All I could find was that they started to make them in 1992 and changed to Tagmasters in 1994 (I believe, correct me if I'm wrong). Thanks for your help guys sorry if this is a repeat question.