Bergeon 6740 Crown and Tap Gauge. Swiss made. Measures the threads of winging stems and crowns. Also measures diameters of tubes, joints, and crowns and measures the distance between the lug of watch cases.
Bergeon 6740 Crown and Tap Gauge. Swiss made. Measures the threads of winging stems and crowns. Also measures diameters of tubes, joints, and crowns and measures the distance between the lug of watch cases.