Cover of the Post of Uruguay sent stampless to the USA General Postmaster on 7/DE/1931, datestamped "S. INTERNACIONAL - URUGUAY", with several arrival marks, VF (Image)

Cover sent to Argentina on 22/FE/1932, with meter postage of 12c. applied by the FIRST POSTAGE METER for Official Mail, it was in use for a short time, sepia-color ink, extremely rare, excellent quality! (Image)

Card of the "Intl. American Institute for the Protection of Children" sent to USA on 13/MAY/1932 with meter postage of 5c. with inscription OFICIAL Y PRENSA, VF quality! (Image)

Cover of the Industrial Chemistry Institute sent to USA on 4/JA/1934, meter postage of 20c. with inscription "OFICIAL Y PRENSA", VF! (Image)

Registered airmail cover of the Ministry of Foreign Affairs sent to Brazil on 5/AP/1934, franked $1.20 with uncancelled definitive stamps. It also bears meter postage along "OFICIAL Y PRENSA" label, and other markings, very interesting! (Image)

Card of the Museum of Natural History sent to Brazil on 25/JUL/1934 with meter postage of 5c. along "OFICIAL Y PRENSA", fine quality (Image)

Card of the Museum of Natural History sent to Brazil on 28/NO/1935, with meter postage of 5c. along "OFICIAL Y PRENSA", fine quality! (Image)

Cover sent by the American Embassy to USA on 15/JA/1936 with diplomatic franchise, datestamped "EXTERIOR - OFICIAL Y PRENSA", VF quality! (Image)

Cover of the Ministry of Public Health sent to Argentina on 12/MAR/1936, meter postage of 7c. with inscription "OFICIAL Y PRENSA", VF! (Image)

Cover of the Ministry of Public Health sent to Argentina on 4/MAR/1936, meter postage of 7c. with inscription "OFICIAL Y PRENSA", VF! (Image)

Card of the library "Corte Electoral" sent registered to USA on 1/JUL/1936, with meter postage of 10c. along "OFICIAL Y PRENSA", with arrival handstamps, excellent quality! (Image)

Cover sent from Paso de los Toros to Buenos Aires on 24/JUN/1937, stampless, bearing good postal markings on front and reverse, VF, scarce origin! (Image)

Official cover sent stampless to USA on 22/NO/1937, datestamped "Exterior-Oficial y Prensa", returned to sender due to incomplete address, it bears a number of postal markings and OFFICIAL SEAL of the Uruguay post, VF and interesting! (Image)

Cover and signed letter of the Vice-President and Minister for Finance sent stampless to Buenos Aires on 7/JUL/1938, with interesting markings, VF quality! (Image)