Typographical overprint of Boma

Quality: 0

N° 100Dr-Cu ‘5c. green’, Mols Bilinge from 1910 mistakenly overprinted in Boma with ‘10c.’ in vermilion, the overprint is inverted, not listed in the catalogue, the stamp is cancelled Boma 17 October 1922 in black on a fragment, vf (OBP €330 for normal overprint)