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	The final competitions of the 21st RSFSR Chess Championship in Omsk
			Special commemorative postmark Якобс: 789 date: 03.08.1961 - 01.09.1961 place: Omsk, post office type: Fixed date
	The chessboard corner and chess pieces: black rook and white horse The stamp was applied in the post office, open at the competitions. On the first day of the competition - on August 3 - purple Ink colour was used for the cancelation, on the remaining days - black

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