[ChrisS]

The 1967 receipt (6 1/2"X 4 1/2") has the backward "K".
There are several dated March,1971 to October,1971 that do not have it. These are 8 1/2" X 5 3/4". This is probably the version Joe has.
There are also 2 from Febuary,1972 where the backward "K" reappears. These are the same size as the ones from 1971.
If I can't figure out how to post these when I get back home next week, I'll send a scan via e-mail.