Southern Nigeria SG 20 Used 1903-04 £1 green and violet

1903-04 £1 green and violet, wmk CA, centrally cancelled by Old Calabar cds, dated "MY 2 04". Fractionally toned, with a couple of slightly shortish perfs at foot mentioned for accuracy, but a rarity in used condition. Only 1080 printed, and the first used example we have handled in more than 25 years. (cat £1000)