Russian Nizhny Tagil big hard carbolite checkers white black shashki vintage

Diameter of the checker 33 mm. Weight 390 g. Box is broken. But it is original. Checkers are slightly different from the mass standard ones. They are slightly larger in diameter (standard checkers have diameter of 30 mm) and are not as hollow inside as usual. They have only a small notch, which makes them heavier than the usual common set.