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The 1958 REI catalog shows this Grivel piton. REI has it named "Italian Corrugated Spoon Piton. 
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Grivel pitons YC Collection c.1950s 
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Grivel
Ring Spike piton and Vertical piton c.late 1950s (?) 
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Grivel - Vertical piton
c.1960s 
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Grivel
Horizontal piton (Early "Top") c.1960s 
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Grivel 1970s (?) piton
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Grivel 1970s (?) piton shown on ebay 12/2022, seller hueyville
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