Greetings. I have an STS-8 cover from heirs of a former deputy USPS postmaster general (no. 254). The cover was carried in the main cabin in one of two boxes mounted to an instrument panel; one of 1001 covers given to museums and high level officials. I'd like to auction it, but want to place a fair reserve on it. Any ideas about the fair market value? Tnx LN
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