The black version of the AE1 and AE1 program is far less common than the chrome one. The reason is price- here in Australia the black one would have cost 15-20% more, and these cameras cost a good 2-4 weeks wage when they first came out.
When I was repairing these cameras you would see maybe 1 black AE1 for every 50 chrome ones. With the AE1 P the ratio was around 1 in 30.
The AE1 was one of the A series that had metal top covers. From memory the AT1 was metal too. The AL1, AV1, AE1P and A1 top covers were all polycarbonate. Strangely the A1's had a metal bottom cover...
You would occasionally see one with a crack in it, but it took a pretty big knock to break one. I once had a AE1P a friend bent when he fell off a ladder. He put a small crack in the top cover maybe 5mm long near where the strap lug is (I melted the cover back together) - but he managed to bend the chasis of the camera over 2mm!
I repaired it so that the film plane was parallel to the lens mount, but the chasis had a bend in it so you couldn't mount a motordrive or winder to it! Still took great photos..
Thanks for the memories..