This Valentine-related image is actually the front of a Cracker Jack card. The inside message is "Have I got a surprise for you! Happy Birthday."
This card is by Hallmark Cards, Inc. No date, but Cracker Jack was a registered trademark of Borden, Inc. so likely was sometime between 1964 and October 1997. I don't think the heart seen coming out of the box was ever an actual CJ prize! Happy Collecting! Gail