First off, there is no Pokemon named Machamion (maybe you're thinking of Machamp?). Secoond there were no reverse holo cards in Base Set. Sounds like you have a fake card, or you're just confused on how to describe what you have.How much would a Base Set Machamion Shiny Reverse Holo First Edition card sell for [Minor Crease in corner, not bad]?
Donezator