1929, 1¢-10¢ Kans. & Nebr. sets complete, each on separate matching A.C. Roessler airmail cachet covers and tied by "Washington D.C., May 1, 1929" First Day of Issue duplex postmarks, purple Special Delivery notice handstamps at right and receiving backstamps, Very Fine, a rare set of First Day of Issue covers. Scott No. 658-668, 669-679  $3,000. $0 (Image)