Rubberstamp autographs - apparently created in Germany (as they almost exclusively appear on East German envelopes) - used by Gagarin, Tereshkova and Titov. The Titov always appears with that same date 1.09.61.
The black Titov rubberstamp has an unknown source.
Deutsche : Stempelautogramme der ersten Kosmonauten - Gagarin, Titov und Tereshkova.
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