This box of greeting cards is probably from the 1970s.  I am the original owner and that is my best guess.  

Box originally contained 25 cards and matching seals but only 20 remain.  Cards measure approximately 7 x 4.5 inches folded.  

20 postalette greeting cards are in excellent condition.  Note that two of them are a lighter color of blue than the rest.  This is how they came.

21 Snoopy seals are no longer sticky due to age.

The box and clear cover are in excellent condition. 

Please see all photos and let me know if you have any questions.