In the 70s and early 80s you might get a record like this made of flimsy plastic as a toy in a cereal box, or as a happy meal toy, etc. never heard of postage stamps but seems like a similar use case.
These Bhutan stamps are delightful, and inspire me to learn more about the country. I hope there might be the prospect of future new releases, this is a kind of thing I could really get into.
A fun thought-game is to construct a small player stamp, onto which you drop a content stamp, blow a little, and hear the results .. I once knew a guy whose business-card could be used to play a record, barely audible, but still ..