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I am very confident that is a tap for making threads in a previously drilled hole. There is a corresponding die that makes the threads on the shaft . Not uncommon back then but you have a beautiful and still functional tool. Thanks for sharing it with us. many blessings

Thank you!
Yes, it does :) I don't dare to use it just because the handle is so fragile after so many years, but back in the day it shuld have been able to make wooden threads :) Thank you for clearing that up!

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