Australia, 1894 Adelaide, South Australia to Cincinnati, O., official Post Office and Telegraph Dept cover franked with South Australia Official 1891, 2½d on 4d deep green tied by "GPO Adelaide, No 16, 94" duplex postmark, Very Fine, an official letter which no doubt was for return or more to pay letter. SG No. O71  Estimate $200 - 300. $0 (Image)