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Yes; "worth" is a function of supply, demand, and the intensity of the demand. It might be very valuable to the right buyers -- but how many of them are there, and do you know how to find them?
Finding some kind of appraiser would be best -- an "antiques roadshow" kind of person. Ebay is a crapshoot; bid prices on identical items can vary from week to week, depending on whether the right people are or are not looking.
Based only on my committed viewing of Antiques Roadshow (I just love it) and the kind of prices I've seen there for 20th century autographed documents, I'd expect the value to be in the hundreds, not the thousands. But you never know.
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