In an update on our mysterious stamp story from yesterday, one of our BowieNet members (glenn) was kind enough to forward this additional information.
There is indeed a set of stamps (8 in total) from St. Vincent. The set is titled famous entertainers. It has two rows of 4 stamps each featuring a different artist. top row :Michael Jackson,Madonna,Elvis presley,David Bowie (the same as the one shown on Bowienet) bottom row :Prince,Frank Sinatra,George Michael and YES! Mick Jagger. We will post the image of the entire series soon. Keep an eye out.