1906 1c, 2c and 5c violet Postage Due Imperforates, all three are unused (no gum, as issued) in horizontal pairs, extremely fine and scarce, with only 100 pairs of each printed. Rsv. (Image)

Unitrade $ 1,500

1934 1c dark violet Postage Due Imperforate, a mint never hinged left marginal horizontal pair, fresh and extremely fine. Only 100 pairs known. Rsv. (Image)

Unitrade $ 1,000

1935 1c, 2c, 4c and 10c dark violet Postage Due Imperforates, each is a mint horizontal pair, with sheet margin at right and large margins, extremely fine. Unitrade notes that "most of the imperf pairs have slightly disturbed gum". These four pairs are fresh with immaculate never hinged gum, with each stamp handstamped "HHH" on back. Rsv. (Image)

Unitrade $ 1,800