Hi, thank you for your question! I have completed thousands of musical instrument appraisals and will be happy to help with yours.
The 5'6" model is no longer made, though Yamaha has a comparable model at 5'8" called the GC1. Yamaha pianos have a terrific resale value on the used market and usually sell quickly. Your best bet, if you're looking to sell, is the private market (selling it yourself, locally). This will net you the largest profit.
Based on the maker, model, age, described condition and depreciation from age, I would recommend a current selling range of approximately $12,500-$14,500. Best wishes!
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Did you need any other assistance with this?