#123b, 1938-51 6d Red violet & gray black, Double impression of gray black, used, lightly cancelled, one of seven copies currently known, the others being a pair, one mint example and three used singles, the pair being the proving piece confirming a double impression, rather than a double transfer, most visible along the shoreline and above the roof of the car, but careful examination will show doubling across the entire vignette, fine and rare; Richard Lockyer Gibbons Stamp Monthly article accompanies; 2004 BPA certificate (unpriced in Scott and unlisted in Stanley Gibbons). (Image)

Est. $1,000-2,000