Clam Treasure Stamp

The  was a Game Stamp on Club Penguin Online. It could only be obtained by playing Aqua Grabber and discovering the secret treasure in the Clam Waters level in Aqua Grabber, which was the rare black pearl worth 10 coins.

Trivia

 * The black pearl's location was randomised every time, and as such, could be held by any clam in the level.