Hi, thanks for your question! Old upright player pianos are very common on the used market, and if not kept in excellent condition aren't worth much. I'm assuming since it hasn't been used in so long that it also hasn't had any tuning or maintenance. Based on this, I would recommend selling for a few hundred dollars if you can find a taker. But you might also give it away in order to avoid having to pay to have it moved. Best wishes!
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