Trial pieces from Mexican federal mints in the 1880s were produced to test die alignment, metal flow, and planchet consistency before authorizing full production runs. This reverse trial — struck from the reverse die alone, paired with a blank or plain obverse — was almost certainly produced at the Mexico City mint during the period when the government was standardizing coinage across its regional facilities following the chaotic output of the Reform War decades.
KM#TS11 is sparsely documented in auction records, which suggests either a very small number survived or that examples have historically been misattributed as uniface errors rather than intentional trials.
Trial pieces from Mexican federal mints in the 1880s were produced to test die alignment, metal flow, and planchet consistency before authorizing full production runs. This reverse trial — struck from the reverse die alone, paired with a blank or plain obverse — was almost certainly produced at the Mexico City mint during the period when the government was standardizing coinage across its regional facilities following the chaotic output of the Reform War decades.
KM#TS11 is sparsely documented in auction records, which suggests either a very small number survived or that examples have historically been misattributed as uniface errors rather than intentional trials.