Great Britain 1881 2½d blue Plate 22 imprimatur, SG157var.
A very fine unused line perforated imprimatur lettered "AC", mounted in a cardboard bevelled frame from the 1887 Stamp Committee presentation album.
Only 36 albums were originally produced, many of which are in institutional collections or simply lost.
A very rare and desirable presentation from the first approved printing sheet.
See Specialised Vol.1 Catalogue pg 351.
Accompanied with a 2006 Royal Philatelic Society (RPS) Certificate of Authenticity.