Rare Stamps & Postal History of the World

1917-30 4a dark green and 1a dark green error of color with recut frame, imperforate, tete-beche pair, setting 12, positions 6-8/14-16, unused top right corner block of six (3x2) without gum as issued, position 8 is the 1a value error of color and being inverted is tete-beche with adjacent 4a values, deep color and a scarcer shade on fresh thin native paper, rare error multiple; only 50-60 examples of the 1a error of color believed to exist, with 1984 Hellrigl certificate,
Cat. Val. $858
Estimate: $250