Security chop, 1944. Missionary cover from the Tibetan town of Huangyuan, Qinghai To USA. Franked with $2 (damaged at opening)and $20
Security chop, 1944. Missionary cover from the Tibetan town of Huangyuan, Qinghai To USA. Franked with $2 (damaged at opening)and $20 stamps, with security chop boxed initial V.G.P. Carried over the Hump, with censor label and DHA cachet. Rare origin of Tibetantown at the head of caravan.青海湟源寄美國， 郵票上鈐私章防揭，其中一枚郵票受損，走駝峰郵路，受檢。
