1922 Thom 3-line Overprint on 2/6 Seahorse

1922 Thom 3-line Sarostát Overprint on 2/6 Seahorse, basic GB stamp from R.1/2 of Plate 3A with major re-entry, very fine mint with full original gum and single small hinge remainder, very fresh colour, centred to the right as usual for this position within the sheet. A rare stamp. SG 64a (£950), Hib T59a.
With clear R.P.S. certificate (1992), and clear BPP certificate (1998).