One thing I found interesting about the valentines is that some of them have quintessentially '70s artwork:
While others appear to be throwbacks from previous decades:
Those are some pretty sassy fishnet gloves she's wearing. Or maybe she just has plaid cuffs on her dress sleeves - it's hard to tell.
This one even had printing on the back. When you turn it over, you can see that the bee on the front is a separate piece with a tab that has been inserted into a slot in the heart and taped in place.