Quote Originally Posted by rthomas View Post
I have a partial box of Kodachrome 4x5" sheet film, expired February of 1949, with the following notch code:

\/ \/ \__/ \__/

If your film doesn't have this, I would guess it's not Kodachrome sheet film. Could it be a rollfilm format that's been cut down to single frames?
It could be rollfilm they are definitely cut by hand. Did all kodachrome sheet film have notch codes? Maybe the notch code might have been cut off.
If it isn't sheet film which company's did make medium format color rollfilm in the 1940s ?