1947年开封寄美国航空封11件,贴各版孙像及孙像加盖国币邮票,销开封不同戳式邮戳,邮资不同,均保存完好,请预览ChinaCollections and RangesPostal History1947 lot of 11 air mail cover from Kaifeng to USA, bearing different print or overprinted Dr.Sun and franking, tied different type of postmark by Kaifeng. All in fine condition.