That's interesting Kaye, I'll check into that model # for 1st Trinitron, even according to Sony company history archives, that model # you gave is not there first Trinitron, maybe a different tv?? Trinitrons were introduced in 1968. I have seen a kv-1500 that preceeds a kv-1510.
P.S. That model# Does check out with Sams, does ANYBODY have a picture of this TV??