Last month, I posted a folding valentine https://graphicarts.princeton.edu/2015/09/18/my-dear-this-heart-which-you-behold-a-puzzle/ and asked if anyone knew the answer to the folding sequence. When done correctly, ours ends up with a small paper heart.
Our sincere thanks to Nancy Rosin, President of The Ephemera Society of America and President of the National Valentine Collectors Association, who posted the answer here: http://www.victoriantreasury.com/library/2007-01_Puzzle_Purses/. This website not only gives you the answer to the folding puzzle but offers another example of a valentine that can be printed and folded for your enjoyment. Give it a try and join me in thanking Ms. Rosin for her help.