Co-discoverers of the structure of DNA. Two items: FDC with a cachet honoring 100th anniversary of the National Academy of Sciences in Washington, D.C., signed on the front in black felt tip by James D. Watson; and a FDC with a cachet honoring the 1978 US postage domestic rate, signed in blue felt tip by Francis Crick. In overall fine condition. RRAuction COA.
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