There's a timeline for Kodachrome production on wikipedia. Can't vouch for its accuracy. It says sheet film Kodachrome was available from 1938 to 1951 in daylight balance (ASA 8) and Type B (3200K ASA 10).

http://en.wikipedia.org/wiki/Kodachrome

When Kodachrome II came out, Ernst Haas bought a refrigerator or two to store all of the original Kodachrome he could find.

Lee