1921 Halifax Air Mail 35c. red Setting I and Setting II Overprint inverted, S.G.148d,i,

block of 4, Positions 8-9/13-14 of the setting, three stamps are the 2¾mm No stop after '1921' (S.G.148d) and one the basic 1½mm (S.G.148i); minor gum tones, one shows through to the surface of the third stamp at the foot, large part original gum. B.P.A. Certificate 2002. AN EXTREMELY RARE BLOCK OF THE INVERTED OVERPRINT VARIETY.

PROVENANCE
Cyril H.C. Harmer, February 2002