Quote Originally Posted by 2F/2F View Post
I have a bunch from the '50s with dates printed on them.
Ah, so much for that theory. Back then I imagine there were lots of places you could get Kodachrome processed, and some of them must have had slide mounting machines that printed the date and some didn't.

By the way, I've got some from 1962 in white cardboard mounts with a blue border, printed with Kodak Ready-Mount. Does anyone know if those are likely to be Ektachrome?