Great Britain 1902 ½d blue green & 1d scarlet O.W. Official, SGO36/7s.
A superb unused, with original gum, set of two in blocks of four, lightly mounted on one ½d stamp only. Each block overprinted "SPECIMEN" type 15.
These specimen examples used solely for reference purposes are very rarely seen in blocks of four.
GB Specialised Catalogue Nos: MO14s & MO15s.
SG Catalogue Value: £3,400+.
The "O.W. Official" overprints were issued to Office of Works. The higher value issues from 2d and above were issued in 1902 for registration fees and overseas mail.
