I agree with Jack, probably no more than $300. Restoring it would probably end up costing you $500, and you'd have a $400 or $500 gun, but it might look nicer. Some folks would simply polish it and leave it as it cleans up. If you were to request a letter of authenticity form the historical society, and it turns out it was delivered directly to a specific person of fame or notoriety, the value would increase. But you'd have to invest $100 for the letter and most likely find out it shipped to Mel's Hardware or some such place.

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Robert
SWCA #2906, SWHF #760