The 2023 Summer Auction - Sale 340 Day 4

1930s a group of 5 FFCs, plus 2 receipts of delivery,including Nanking-Peiping, Peiping-Nanking, Canton-Hanoi and other flights, all f.w. airmail issues.

1930年代一組5枚首航封，另附2枚收件憑單，包括南京-北平、北平-南京、廣州-河內及其他航線，均貼航空票。