Hi Martin,

This year i bought a big set of old climbing gear from Wolfgang Rauschel. He created this nut in the 1970's years. 
Wolfgang climbed more than 4000 mountains and is the author of some books. In the late 1970's he climbed with Kurt Diemberger in Greenland.
The nuts are a gift for you.
 
From: Matthias Hofle

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Made of aluminum and one small nut made of red plastic.

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