Marks:

"ТФ7" - the hallmark of the Tallinn Jewelry Factory, year 1957.

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

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