In aluminum, "cold" enamel and lacquer; 50 mm diameter; Raised maker mark of Moldova Experimental Mechanical factory.
Nicely made badge in very fine to excellent condition with the tiny ding to the enamel not immediately noticeable.
This is an official exhibition participant badge. /See "History of Awards and Insignia of Russian MVD, 1802 - 2002", p. 424, fig. 5.67/.