民国四年交通银行伍,拾,伍拾,一百角背单面试印钞票一组5枚,少见;Bank of Communications, set of 4 progressive proofs of the reverse, 1915, 50, 100, 500 and 1000 cents, black and multicolour, also an extra reverse proof for the 100 cents in brown,(Pick 121pr to 122Bpr), almost uncirculated, previously mounted, the 1000 cents has a defective bottom left corner. Very rare group (5)