1928 and 1933 a pair of Qiaopi (remittance letter) from Canada to the same address at Lungkongli, showcasing "Free Reply within Three Days"
1928 and 1933 a pair of Qiaopi (remittance letter) from Canada to the same address at Lungkongli, showcasing "Free Reply within Three Days" promotional markings offered by the agents1928及1933年一對加拿大寄龍江里相同地址之銀信，均鈐三天內回信不收郵費之批局宣傳直戳，十分有趣。
