Lot 2504

1919 Experimental PO B-520 (3 Sep) to England, f.w. Indian KGV 1-1/2a, tied by extremely scarce Experimental PO B-520 cds. It is the only known example of the B-520 PO. Extremely scarce. An absolute rarity. Illustration from “Tibet Stamps and Postal History” by Steven Chazen and Danny Wong fig 10, p. 119.

1919.9.3 試驗郵局B-520寄英國，貼印度佐治五世1-1/2安娜，銷極為珍罕之試驗郵局B-520日戳。此為該局之唯一存世例子，為無可比擬之一大珍品。蔡盛及王劍智著《青康藏郵驛史》第119頁圖例10號原件。