K25 and K64, using the K-14 process, came out in 1974. Kodachrome II, ASA 25, and Kodachrome X, ASA 64, both using the K-12 process, preceded them. The K-12 process and KII came out I think about 1961. I'm not sure if KX came out at the same time, but I think it was a little later.
Originally Posted by nworth