Hi Pete,

Your Curt Teich linen cards are easy to date . Actually, they're pretty much the only cards that I know how to date!

Look at the first 2 characters of the code number. On your cards the code numbers are in the lower right corner...I've also seen them in other locations, including in the stamp box.

The first character is the "year", the second character is the decade...starting with 1930

So...the first character is a 0-9
The second character code is:
A=1930
B=1940
C=1950
D=1960

Your first card is coded 9B, so it is 1949.
Your second card is coded 7A, so is 1937
Your third card is coded 1B, so is 1941