Co-winner of the 1962 Nobel Prize for Physiology or Medicine for the discovery of DNA. Original signed ballpoint sketch of a double helix DNA strand, with a notation of “A-T, G-C,” next to the strand on a 6.5 x 3.75 First Day Cover, which bears a color silk cachet honoring energy development, and signed “James D. Watson.” In fine condition. Particularly elusive in uninscribed examples. Pre-certified PSA/DNA and RRAuction COA.
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