The Club Bingo card and the Last Frontier Western Village card both look like they're probably Curt-Teich linens. If they are, the first 2 characters of the code in the bottom right corner are the date code.

The number is the year, the letter is the decade. A is the 1930's, B is the 1940's, etc.

For example:
6A is 1936
1B is 1941
0C is 1950
7C is 1957

The linens usually have the code in the lower right corner, on the front of the card. Other Curt-Teich cards have the code in other locations...sometimes it's in the stamp box.