Hello there - have another newbie question

I have a 20" Sabian Rock Ride from probably about 1983 (84?). There is no indication of make - no "Hand Hammered" or "HH" or anything other than the Sabian logo and Rock Ride in ink. Can anyone tell me what make of Sabian cymbal this is, or how I might be able to tell what year it was made? It's been a part of an 84 Ludwig Rockers set since the set was purchased, so I know it's at least that old.

Thanks in advance

David