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The serial number indicates that your piano was built in 1930. The patent date indicates that the piano could have been built no earlier than its date.
Your piano has not been regularly tuned and I'm assuming it has had no recent internal restoration. Old pianos have no value just for being old. In other words, prospective buyers are not collecting pianos; they want to be able to play them. Pianos have parts that wear out and must be replaced, and a piano that hasn’t been regularly tuned will not hold a tuning. So, old pianos are at a disadvantage in the market, even when they look pretty good one the outside.
In un restored condition, your piano has a current retail (replacement or insurance) value of approximately $500. If you were to sell it, you could expect to get the fair market (private sale or auction) value of approximately 40% of the retail amount or $200, depending on location and actual condition.
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