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Rare german mystery micrometer hahn kolb


this rare micrometer seems to be clean but the spring loaded mechanism might be stuck. I don't think it is broken-but I don't know. I am thinning out my collection and don't need this anymore. I don't really understand how it works.
Brown sharpe mahr starrett federal antique vintage etalon tesa alina cosa



Rare german mystery micrometer hahn kolb