This piton is from Yvon Chouinards collection. I was thinking this piton is a Dolt angle shown in the 1958 Dolt catalog. But it also could be a George Rea piton. The Dolt pitons had a silver coating on them where this piton is in great unused condition but is rusty. Of course the 1958 Dolt pitons when they were first made could have been uncoated.