Marks:

"МЮ5" - the mark of the Jewelry and Watch Factory, Moscow, year 1955.

The triple Soviet hallmark in the form of a shovel, 1954-1958 –
"worker's head" with letter "Δ" (delta) and number "875", where:
"worker's head" – the national hallmark;
"Δ" (delta) - code of the Moscow Assaying Office.
"875" – the fineness mark.

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