You can buy the original carbon copy of Alekhine's scoresheet from win his against Paul Schmidt played at Salzburg 1942. HERE. I wonder if my autograph of Dr. Max Euwe or my complete set of about 40 post cards from my correspondence game with Reshevsky would fetch any money on e-bay?! Euwe wrote, "I wish you good luck with chess interest. Sincerely, Dr. M. Euwe" Most of the Reshevsky cards are just signed, "Regards, Sam" but a couple are signed, "Sam Reshevsky"