Thanks for your question!
This piano was built in 1999 based on the serial. The GP 163 is Boston's 5'4" baby grand model. These are quality pianos and well known for being competitive with many other mid-grade instruments on the market today. Of course, the affiliation with Steinway helps significantly. Considering depreciation in value from age as well as your description of excellent condition, I would recommend a selling range of approximately $8,800-$10,000 in a private sale. Best wishes!
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