This Champion Roc commemorates hole #5 at Winthrop where the USDGC is held each year.

This is one of the 4 stamps made in 2004. There were approximately 500 of each stamp made.

The 180s seem to carry more of a premium on the older discs, but other than that, I think personal preference of color is the only thing that might make some worth more than others.

The clear ones are especially collectable, but that is every year.