Brass nut, round, 1.6 cm (0.63 inch), M10x1

Information

Round brass nut with an outside diameter of 1.6 cm (0.63 inch).
The center opening measure 1.0 cm (M10 x1 internal thread) 0.39 inch).

More or less the same nut (M10): here
Slightly larger nut (M10): here
Messing nut (M13): here

Nut chrome (M10): here

Vintage material.