Printed 'Ministerio de Obras Publicas Direccion de Irrigacion de la Nacion' registered cover franked with 1924 2c deep brown and 20c ultramarine and strip of three 1926 5c red 'Postal Centenary' issue all with 'M.O.P.' Ministry of Public Works official overprints (SG OD37G, OD42G & OD44G) tied by BUENOS AIRES cds's dated DEC 7 1928 with printed registration label alongside also tied by the cds and oval official cachet and 'Signature' handstamp in purple. Addressed locally within BUENOS AIRES with arrival cds's on reverse. Cover has a few light tones.