1933 Tibet 3rd issue 1tr in complete sheet of 12 with double horizontal perforation variety. With "Tanka each" annotation at right marign.
1933 Tibet 3rd issue 1tr in complete sheet of 12 with double horizontal perforation variety. With "Tanka each" annotation at right marign. Very scarce double-perforation example. Illustration p. 267 in "Tibet and Stamps and Postal History" by Steve Chazen and Danny Wong.1933年西藏第三版1章噶全張十二方連，帶複齒變異，右邊紙寫有“Tanka each”批注。十分難得之複齒變異。蔡盛及王劍智著《青康藏郵驛史》第267頁號原件。
