Vintage 1930 Sterling Silver & Calcite Frog Pin Brooch Mexico

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Vintage Solid sterling silver frog pin made in Mexico in the 1930s. It is set with bright calcite also mined in Mexico. Partial hallmark on the back. Silver has original patina that is now a gunmetal gray color. Measures 1 3/4" by 1 1/4" . Weight: 19.4 grams.