2c green 'Casa de Correos y Telegrafos de Guayaquil' overprint issue with variety OVERPRINT DOUBLE ONE INVERTED. A fine mint corner marginal block of four. (SG 490b)
2c green 'Casa de Correos y Telegrafos de Guayaquil' overprint issue with variety OVERPRINT DOUBLE ONE INVERTED. A fine mint corner marginal block of four. (SG 490b)