Central State Assay Supervision Inspectorate in Moscow

December 1989. USSR. Moscow. Senior assayer L.S. Antonova during a chemical analysis necessary for the precise determination of the content of precious metals in a serial jewelry item produced by one of the jewelry factories, using the cupellation method in a muffle furnace in the chemical laboratory of the Central State Inspectorate of Assay Supervision. The exact date of the photo is unknown. Gennady Khamelyanin/TASS