USSR. Award badge of the All-USSR Union of Metal Workers (VSRM) 1920s. The VSRM was formed in January 1918, the union united workers and engineers of machine-building and metalworking enterprises.
Silver 84 samples, alpha, female head. The brand of the KPU workshop. The enamel is intact. Screw mount, the screw is shortened. Natural patina. Size 34.6*28 mm. Weight (without nut) 7.5g.