1958 (ca) entire envelope, pre-printed sideways "United States Air Mail Postage 6c", fully imprinted inside (mirror image) in violet, handstamped "Canceled" in red, unused, v.f. and most unusual (Cat No. UC25E) (Image)

Est.$500

1958 (ca) entire envelope, pre-printed horizontally "United States Air Mail Postage 6c", fully imprinted inside (mirror image) in violet, unused, v.f. and most unusual (Cat No. UC25E) (Image)

Est.$500

1958 (ca) entire envelope, pre-printed horizontally in red "United States Air Mail Postage 6c", double impression, one inverted, fully imprinted inside (mirror image), handstamped "canceled" in red, unused, v.f. and most unusual (Cat No. UC25E) (Image)

Est.$500

1958 (ca) entire envelope, horizontally pre-printed "United States Air Mail Postage 6c" in red, double impression, one inverted, fully imprinted inside (mirror image), unused, v.f (Cat No. UC25E) (Image)

Est.$500

1958 diagonally pre-printed "United States Air Mail Postage 6c", fully imprinted inside (mirror image) in violet, further handstamped "canceled", legal size envelope, unused, v.f. (Cat No. UC25E) (Image)

Est.$500

1958 6c entire envelope, horizontally imprinted "United States Air Mail Postage 6c" (every other line with inverted wording), fully imprinted inside (mirror image) in red, indicia handstamped "Canceled", unused, v.f. and most unusual (Cat No. UC25E) (Image)

Est.$500

1958 6c entire envelope, vertically imprinted "United States Air Mail Postage 6c" (every other line with inverted wording), fully imprinted inside (mirror image) in violet, indicia handstamped "Canceled", outside borders omitted, unusual (Cat No. UC25E) (Image)

Est.$500

1958 (ca) 6c red + 1c green, two entires (one legal size) with red and blue borders, each with Plane Train and Ship surcharge essay without denomination or "U.S. Postage" label, both with black "Canceled" overprint, v.f., rare and unlisted (Cat No. UC30E) (Image)

Est.$1,000

1961 11c red and blue plus 11c blue and red, two essays, each hs "canceled" in red, each with shifted globe, v.f. and incredible find. The original entire was issued in red and blue (Cat No. UC35E) (Image)

Est.$1,500

1968 (10c) carmine Air letter sheet, large die proof on watermarked stationery paper, printed diagonally, v.f. and undoubtedly rare (Cat No. UC40) (Image)

Est.$500