I think your best bet is to email UFiP and ask them. The little hi-hats symbol appears on a 1975 catalog of theirs, but that doesn't really narrow it down in time. In that same 1975 ICTUS 1975 catalog the drum kit cymbals show the Ritmo stamp which is different again.
I've tried to draw together a quick overview from a few different sources, but everything is very tentative at this point:
The Pyramid stamp (50s - 60s)
Ritmo went from 70s to 1995ish
Bravo late 70s - early 80s
The Class series started in around 1990, and the other lines we see now (Natural, Rough, Experience) came in over the next few years.
But I'm not sure where yours fits into the picture.
The inked "Medium Light" on it rules out the period when they were just doing the L,M,H and weight. The Bravo series is the first one where they put things like Ride, Crash Ride, Ping, Bounce Ride on them. But "Medium Light" doesn't appear in that 1975 catalog.
Please let us know (post back here) if you do find out the dates for yours because I'm collecting up examples to create a timeline (if I can get enough information).