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Mason and Hamlin pianos were some of the best American made pianos in the early 20th century. Their quality was comparable to Steinway and Baldwin. The model A is a popular size for home use. Because it is about 100 years old, the value would be much less than a new one, as the thousands of mechanical parts wear out over time. Pianos which have been fully restored are worth much more, due to the improvement of condition. Based on your description of maker, age, size and condition and considering the used piano market, I would recommend a selling range of approximately $5,500-$6,500 (depending on actual condition and local market). Best wishes!
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