Zildjian Avedis Brilliant 20" ride.
This range was manufactured during the late 60s early 70s and made with a high reflective gloss.
The original gloss has somewhat dulled over time.
The mounting hole is round
The cymbal is not warped and has no cracks.
The stamp includes the name Constantinople not to be confused with the original range of the same name.
See image of an advert to publicise this cymbal which appeared in Downbeat magazine from the early 70s.