Postage Due stamps. 1920-21, Views and Historical Places, imperforated proofs of 50f-20m, two complete sets of six in red or black and complete set of four in blue (proofs of 1m and 20m had never been produced in blue), no gum as produced, mostly VF and scarce, only 50 sets possible in matched color (Image)

Postage Due stamps. 1920-21, Views and Historical Places, imperforated proofs of 50f-20m in various colors, 13 stamps altogether, each one with double impression, no gum as produced, mostly VF (Image)