[Slump Tester]

I have a Bell & Howell Auto 35, which as I understand was the prototype of the Canon AE1. (I don't know if that was true or not.) I got it in 1972, and have always loved it. AFAIK, the main difference was only the front element of the lens was changeable.

[disclaimer]

Prototype of the Canon FT (and later FTb), not the ‘automatic electronic’ AE1 featuring one of the first SLRs with a plastic body. Search for a picture of the Canon FT or FTb, you'll see they're very similar.