USSR 1937 Moscow 17th International Geological Congress Temporary Postmark - Very rare

SOVIET TEMPORARY POSTMARK: 17th INTERNATIONAL GEOLOGICAL CONGRESS

Moscow 1937 (23 July) - Envelope sent locally from the 17th International Geological Congress, correctly franked at the 10k innercity rate (tariff of 25 February 1933). Superb strike of the congress special postmark. Arrival on reverse 24 July 1937. Very Fine.

Very rare special postmark. The International Geological Congress took place in Moscow from 21 to 29 July 1937.

Michel 371 A

Standard 234

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