I have about a dozen, but none are later than the mid-1980s.
I just bought a Pearl Model 41 Copperhead, and she is a beauty.
I bought it from a wholesaler, who has knives in stock dating back several years.
It has the Q stamp with Titusville, PA USA on the tang with PH-D2 at the bottom.
I was hoping someone could help pin the manufacture date down a little.
I'm working on building a lightbox, so hopefully I will get some nice pictures before too long (I've given up trying to get a decent image with my scanner!).
Thanks!