Title:
Lot 901 KGVI "RETURNED FOR POSTAGE" COVERS; 1951/2 covers to G.B. (4), each underpaid for the new airmail rates and so returned for additional postage and all duly forwarded fully paid; marks inc. boxed "RETURNED FOR/ADDITIONAL POSTAGE..." (2) and the similar 4-line "Air Mail must be fully prepaid" mark (2). Scarce & spectacular group. (4 covers).