1931 Ulanbator (17 Nov) to Kalgan. Red band cover, f.w. revenue stamp surch 5 menge + 20 menge on reverse, tied by Ulanbator cds, alongside
1931 Ulanbator (17 Nov) to Kalgan. Red band cover, f.w. revenue stamp surch 5 menge + 20 menge on reverse, tied by Ulanbator cds, alongside with T mark and vertical ROC d.s. (12 Dec 1931). In combination with ROC postage due 20c + 30c, tied by Kalgan (12 Dec) cds. Hellrigl stated that it is one of the earliest covers to bear the vertical ROC d.s. Illustration fig. 194, p. 252 in "The Postal History of Mongolia 1841-1941" by W C Hellrigl.1931.11.17 烏蘭巴托寄張家口。紅條封,背貼印花稅票改值5 menge + 20 menge,銷烏蘭巴托日戳,旁鈐T章及中華民國日期直戳(1931.12.12)。加貼民國欠資票2角 + 3角,銷張家口12.12到達戳。Hellrigl指此為最早蓋有中華民國日期直戳之信封之一。Hellrigl著《The Postal History of Mongolia 1841-1941》第252頁圖194原件。