5c red on white 'Rivadavia' postal stationery envelope (H&G B7a) used with fine strike of ES. N ZAMA (B.A.) railway station cds in blackish purple dated 16 MAY 1889. Addressed locally within BUENOS AIRES with boxed '6' marking in front and ABONADOS No.3 and BUENOS AIRES arrival cds's on reverse. A scarce cancel.