U.S.; Airmail, 1918, First Issue, 6¢-24¢ Complete, Blocks of 4, #C1-C3, n.h., C2 and C3 very nice centering, C3 should be gradeable, Fine to Very Fine.
Scott $1,440.
Estimate $300-400. (Image)

Est. $300.00-400.00

U.S.; Airmail, 1918, 6¢ Orange, Plate Block of 6, #C1, n.h., small top pl. #9155, small perf separations at top, otherwise Very Fine.
Scott $1,000.
Estimate $200-250. (Image)

Est. $200.00-250.00

U.S.; Airmail, 1918, 6¢ Orange, Plate Block of 6, #C1, l.h., small top pl. #9115.
Scott $700.
Estimate $200-250. (Image)

Est. $200.00-250.00

U.S.; Airmail, 1918, 6¢ Orange, Block of 36, #C1, n.h., incl. left arrow block of 4, Fine.
Scott $4,320+.
Estimate $600-800. (Image)

Est. $600.00-800.00

U.S.; Airmail, 1918, 16¢ Green, Plate Block of 6, #C2, l.h., small top pl. #8900, Fine to Very Fine.
Scott $900.
Estimate $250-350. (Image)

Est. $250.00-350.00

U.S.; Airmail, 1918, 24¢ Grounded Plane Variety, #C3 var., o.g., Fine.
Estimate $200-300. (Image)

Est. $200.00-300.00

U.S.; Airmail, 1918, 24¢ Carmine Rose & Blue, Block of 12, #C3, n.h., with arrow and pl. number, natural gum creases, Fine to Very Fine.
Scott $1,560 as singles.
Estimate $300-400. (Image)

Est. $300.00-400.00

U.S.; Airmail, 1918, 24¢ Carmine Rose & Blue, Plate Block of 12, #C3, n.h., with two Tops and pl. #8493 and 8492, gum skips, weak perfs and owners handstamps, otherwise Fine to Very Fine.
Scott $2,000.
Estimate $400-500. (Image)

Est. $400.00-500.00

U.S.; Airmail, 1923, Second Issue, 8¢-24¢ Complete, Blocks of 4, #C4-C6, top two of C4 and C5 o.g. (h.r.), C6 top two l.h., bottoms of all n.h., Very Fine.
Scott $855.
Estimate $200-300. (Image)

Est. $200.00-300.00

U.S.; Airmail, 1923, 8¢ Dark Green, Plate Block and Block of 6, #C4, n.h., side #14824 pl. block of 8, Fine to Very Fine.
Scott $540.
Estimate $120-140. (Image)

Est. $120.00-140.00

U.S.; Airmail, 1923, 16¢ Dark Blue, Plate Block of 6, #C5, n.h., wide side pl. #14829, Very Fine.
Scott $2,150.
Estimate $400-500. (Image)

Est. $400.00-500.00

U.S.; Airmail, 1923, 16¢ Dark Blue, Plate Block of 6, #C5, n.h., wide side with pl. #14831, Very Fine, 2009 P.F. cert.
Scott $2,150.
Estimate $400-500. (Image)

Est. $400.00-500.00

U.S.; Airmail, 1923, 24¢ Carmine, Plate Block of 6, #C6, n.h., large bottom pl. #14841, staple holes in margin, Fine.
Scott $2,750.
Estimate $300-400. (Image)

Est. $300.00-400.00

U.S.; Airmail, 1923, 24¢ Carmine, Plate Block of 6, #C6, n.h., large bottom pl. #14843, staple holes in margin, Fine to Very Fine.
Scott $2,750.
Estimate $300-400. (Image)

Est. $300.00-400.00

U.S.; Airmail, 1923, 24¢ Carmine, Plate Block of 6, #C6, o.g., large bottom pl. #14842, Fine to Very Fine.
Scott $1,850.
Estimate $300-400. (Image)

Est. $300.00-400.00

U.S.; Airmail, 1928, 10¢ Lindbergh, #C10a, n.h., 5 complete booklets, Fine to Very Fine.
Scott $1,150.
Estimate $200-250.

Est. $200.00-250.00