Tonga 1893 surcharges set of 5 to 10d on 1s Officials, SGO6/10Tonga 1893 (Dec) surcharges set of 5 to 10d on 1s surcharges Officials, uniformly in ultramarine, SGO6 10. A fine unused set with large part original gum and with fresh colours. Typical mixed centring but fine and attractive appearance. Much above average condition for this difficult set, with most examples found in poor condition. Rare as less than 20 sheets were surcharged. The "G. F. B." overprints represent the Government Printing Office,