1918-1919 a pair of On Active Service covers to Britain from the same soldier. One from Hong Kong while another one from Vladivostok,
1918-1919 a pair of On Active Service covers to Britain from the same soldier. One from Hong Kong while another one from Vladivostok, scarce pair reflecting Hong Kong garrison participation in intervention of Russian Revolution. Scarce thus.1918至1919年一對On Active Service軍郵封寄英國，一件寄自香港，一件寄自海參威。反映出駐港英軍參與干涉戰爭鮮為人知的史實。
