The prototype version of "Hippocampus" differs quite a bit from the final production version.  In the prototype, the seahorses are all wearing Christmas hats; there is a lot more ocean "vegetation" floating around; and the treasure chest is featured on the reverse with larger "gems".  There are only a few of the prototypes available.
The Hippocampus Ball Ornament - Prototype
Part of the High Design & Christmas Past collections
Handcrafted in Poland
Made from glass
Approximately 4 inches tall (10cm)
Includes original manufacturers box and packaging
Made by Thomas Glenn Holidays