I assume you are referring to the 3-sided (triangular) coin. I believe it is a 3 year run from 1996 to 1998. I've seen them listed on eBay every now and then and they are very popular. Least popular of the 3 is the 1997. I wanted the gold version but just like the silver, they are very popular.
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The gold ones are cool. Heck, they're all cool. That's why they're popular.
That's why they're also tough to get hold of, too, I guess.
Walt
Walt