1932, triple black surcharge 6c on the First Air Post stamp of 5c brown olive, block of four, nice and fresh with usual centering, full OG, NH or LH (top right stamp) and fine, scarce multiple as only 200 such errors were printed, each stamp with D. Forester guarantee hs, Greene Foundation certificate (mentioned as NH block), C.v. $1,875++ (Image)

1938, Monoplane over Mackenzie River, 6c blue, four plate No.1 blocks of four, matched set from all four corners, nicely centered, full OG, NH, VF, Unitrade C.v. CAD180++ (Image)