Tonga SG66 1923-4 2d on 10d Corner Block (Plate retouch NW Corner) M/M

1923-24 2d on 10d black and lake type 27 surcharge in blue wmk upright lower right corner block of 4 pos. 49-50/59-60 on the sheet showing frame plate retouch (at NW corner) on pos. 59 and characteristic retaining pinhole (part of the surcharging process) between 59 and 60 fresh large part o.g Crease in lower margin but an attractive positional piece. Only 155 sheets surcharged. (cat 100+) Originally purchased from Stanley Gibbons (still on their card)