German officer (1907–1944) who was one of the leading members of the failed plot to assassinate Adolf Hitler as part of Operation Valkyrie, which led to his execution by firing squad. Signature with inscription in German, signed “Sending Kisses and Hugs, Claus,” on the reverse of a 4 x 5.75 Cavalry School—Hanover postcard, postmarked May 14, 1936. Brief note written vertically along the left edge of a postcard, with a note and address in another hand. In fine condition, with a bit of trivial foxing. Pre-certified John Reznikoff/PSA/DNA and RR Auction COA.
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