As you can see, the set consists of four bronze weights and eight porcelain weights. One weight (bronze) bears the stamp MTZ 1925 (1925 Moscow Brake Plant 1925). Yes, there the year is 1925, not 1940 (look carefully).
Eight porcelain is the weights of the Leningrad plant. Set (12 pieces) bronze porcelain weights hammer and sickle Soviet USSR. Set (12 Stück) bronze Porzellan Hantel Gewichte Hammer und Sichel Sowjet UdSSR. The item "Set (12 pieces) 1920-1930s bronze porcelain weights Soviet USSR" is in sale since Thursday, December 3, 2020. This item is in the category "Collectibles\Tools, Hardware & Locks\Scales".The seller is "ribe800" and is located in ex-USSR. This item can be shipped worldwide.