Thank you for your patience.
The serial number records for this maker shows that your piano with the serial number 86401 was built in circa 1924, so your piano is about 92 years old.
As I mentioned before the expected life of a piano with normal usage is about 60 years due the deterioration of the parts with age and usage. Thus one of the overriding factors in any appraisal valuation is the age and condition of the internal mechanics. The restoration/rebuilding completed around 50 years ago will have reset the clock, so to speak, at that point but not back to zero. There will also be considerable depreciation since the rebuild.
Pianos which are not regularly tuned, even though they are not played much, if at all, can be at a disadvantage when selling because they may need a number of tunings over a few months to get them back into shape and to ensure the stability of the tuning.
Therefore based on the information I have and the details you have given, I believe your Horace Winter Baby Grand Piano now has a value in the $2,200 to $3,500 range for a private sale
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