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Registered letter dated around 1950, sent from Riga (R.S.S. of Latvia) to Belgrade (Yugoslavia), with two obliterated Soviet stamps (10 kopecks and 20 kopecks). The reverse indicates the recipient: Miodrag Mrdja, rue Rujica 9, Belgrade, and the postmark 'ABNA PAR AVION' from Riga. The envelope also bears a violet 'Registered' stamp.