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Very Unusual Early Drill Type Tool

Very unusual early 19th century gunmetal and metal drill type tool which I believe to be a valve ...

Very unusual early 19th century gunmetal and metal drill type tool which I believe to be a valve lapping tool. The round part only has 3 sections of teeth which means that when you turn it it goes backwards and forwards very quickly. 15" long. 

£45.00 £36.00