I have a 72 coupe and it has the snap out glass rear window. I always thought that 72 was the only one with that. I had a 68 and a 70 but I can't remember if they had that or not. I have a bet with a friend that 72 was the only one with that window. Anyone know?

 

Coupes from 68-72 all had removable rear window. Source Corvette Black Book. Wells

 

I have a 70 with a removable rear window. I believe they were available from 68-72. Real nice feature greatly assists air flow. Kind of like driving a convertable with a roll bar.