One of my company's clients whom I'm currently working with is the National Confectioners Association. I'm working on their blog, and ran across an entry that mentioned these stamps, which look and smell (!) like chocolate. These were issued in France to mark the 400th anniversary of the arrival of chocolate beans at the port of Bayonne.
If I collected such things, I would so want to get a set of these! They look tasty, don't they?