Saint Petersburg Mining University, Saint Petersburg, Russia:

V. Yu. Bazhin, Head of the Department of Process and Production Automation, e-mail: Bazhin-alfoil@mail.ru
V. V. Vedernikov, Deputy Supervisor of the Museum of Mining, Doctor of History Science, e-mail: vedernikov75@mail.ru
D. V. Gorlenkov, Deputy Head of the Department of Process and Production Automation, e-mail: denis.gorlenkov@gmail.com

This paper continues a series of publications on the history of Russian silver 1 Rouble coins and the contribution of the Saint Petersburg münzmeisters, who graduated from the Mining University, to the coin business. The study focused on silver 50 Kopecks coins of the 1922–1924ss made by the former münzmeister of the Saint Petersburg Mint Petr Latyshev, who graduated from the Mining School. A study of archives confirmed his involvement in the minting of the first silver coins issued by the Soviet State in the 1920s at both the Leningrad Mint and the London Mint. The authors examined silver 50 Kopecks coins of the 1922–1925ss and established certain features of their production. By means of modern technology, the authors examined the distribution of chemical elements across the surface and defined the structure of the silver matrix. A relationship was established between certain elements and the hardness of different areas of the coin. All experiments were conducted using state-of-the-art equipment of specialized laboratories at the Saint Petersburg Mining University. The new approach to the study of historic artefacts enables to get a deeper insight into the production technology that was used. Vickers microhardness tests helped establish that the segregation can be primarily linked to such elements as nickel, copper and lead, which may affect the quality of the final product if their concentration is high.
This research study was carried out as part of the preparation research work for the exhibition of the Coin Collection of the Saint Petersburg Mining University’s Museum of Mining, as well as in the framework of the cooperation agreement signed on 29/11/2019 between the Saint Petersburg Mining University and the Museum für Naturkunde at the Leibnitz Institute for Evolution and Biodiversity Science in Berlin, Germany.

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