Here's what the post office's site has to say about the stamps. First the cover stamp:
Aquaman #5 (of 5)And the Jim Aparo solo stamp:
Oct. 1989
Art by Curt Swan & Al Vey
Aquaman defends both land and sea with great strength, speed, and the ability to communicate telepathically with all marine life. His ultimate goal is to help both realms put aside their natural prejudices and unite in peaceful coexistence.
AquamanUpdate: Mark Evanier reports on the stamps, and expresses disappointment that they didn't choose a piece of art by Paul Norris for the Aquaman stamp, as Norris created Aquaman. Personally, I would have liked a Cardy or Fradon. Aparo and Swan aren't best known as Aquaman artists.
Art by Jim Aparo
The memories of Aquaman's personal tragedies run deep after he loses his son, his wife, and his monarchy. Nevertheless, the former King of the Seven Seas remains determined to protect both the Atlanteans and surface dwellers from those who endanger them.