Gambia 1905 Gabon Receiving Authority Specimen, Double Stamp

GABON RECEIVING AUTHORITY SPECIMENS: 1905 KEVII 7½d blue-green & carmine wmk MCA (SG 65) with DOUBLE IMPRESSION of an UNRECORDED presumably local SPECIMEN handstamp (12x1.5mm), also with partial strike of receiving authority handstamp "Colonie de Gabon et du Congo Francais/ Direction de L'interieur." Unused, diagonal pressed crease, sound appearance. Probably a unique combination with double SPECIMEN handstamp thus. From the Gabon UPU archive.