I bought a set a couple of years ago and found this information on the web at http://www.calzaretta.com/revolvers.html

In 1989 Colt produced 500 Snake Eyes. This is a pair of 2 1/2" Colt Pythons in a nicely detailed display case. One revolver was finished in Ultimate Stainless and the other in Colt's Royal Blue. The grips are scrimshawed with a pair of dice on one side and a diamond straight flush on the other side. The barrel is marked Snake Eyes in place of the usual Python marking. Along with the revolvers Colt produced playing cards, dice and poker chips to go along with the set.