Petroleum Stamps of the World

Two printing of Argentina's Comodoro Rivadavia stamp above.
(note the yellow color in the central area of the right-hand stamp).

A specimen (muestra) overprint and two official overprints (long and short versions).

A specimen (muestra) overprint on an official overprinted stamp and two overprints
for Argentinian ministries (Ministry of War and Ministry of Public Works).

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