CANADA, 1932, 6c on 5c Brown, Air Post, Pair, One Without Surcharge (C3d).
Block of four with selvage at left, top pair lightly hinged, bottom pair Mint N.H.,
bold color on fresh paper, Very Fine, a rare error block of which only ten pairs
thought to exist, ex Boonshaft, with 1966 P.F. certificate, catalogued as two pairs, Scott $2,300.00, Unitrade C$3,000.00
Image Magnifier / Download
View PDF of certificate
Power Search for Comparables