Great Britain 1890 10s Ultramarine (I.R. Official), SGO10b.
Superb used horizontal pair overprinted in blue-black (white paper) lettered NF-NG, beautifully cancelled by crisp Birmingham thimble circular date stamps for JU.16.1891.
An exceptional multiple priced at the same value as two single stamps in SG catalogue.
GB Specialised Catalogue No: L8(4)b.
