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6 Pesos Pattern, Tortuga Verde, Iron-Copper-Nickel

Issuer Casa de Moneda de México (Mexican Mint)
Year 2015
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Shape Dodecagonal (12-sided)
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Reverse description A green sea turtle (Chelonia mydas) is depicted in left-facing profile, swimming with flippers extended, rendered in fine relief against a plain field. The denomination $6 appears above the turtle, while the inscription PRUEBA SIN VALOR and mint mark Mo are positioned to the lower left, with the date 2015 below; the species names TORTUGA VERDE and CHELONIA MYDAS are inscribed within the legend area of the reverse.
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Mint (Mº)
Mexican Mint (Casa de Moneda de México), Mexico City, Mexico (1535-date)
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Additional information

The Tortuga Verde (green turtle) belongs to Mexico's long-running Ibero-American series of collector patterns, though this iron-copper-nickel composition places it among the experimental bimetallic and alternative-alloy trials the Casa de Moneda periodically strikes alongside its standard issues. Mexico's mint has used the sea turtle motif across multiple pattern denominations, testing alloy combinations that were never adopted for circulation — this composition being one of the more unusual, given that iron-bearing coin alloys corrode readily in humid coastal environments, which makes the choice of subject matter grimly ironic.