20c brown 'Postage Due' issue with 'Correos 1901' overprint, a fine unused block of four with variety ITALIC 'O' IN CORREOS on position 3. (SG 181)
20c brown 'Postage Due' issue with 'Correos 1901' overprint, a fine unused block of four with variety ITALIC 'O' IN CORREOS on position 3. (SG 181)