Based on your description and the serial number dating this piano to before 1900, it is in the order of 115 years old.
Apart from a very few unique and rare instruments, pianos are not usually bought as antiques in the furniture sense of the word because they are normally purchased as a musical instrument to be played.
Generally pianos have a limited life span of 60 to 70 years, mainly due to the wear during use and particularly due to the natural deterioration of the major mechanical parts such as the action, the strings, the soundboard, the tuning pins, the pin block, etc., over time. This can be extended by careful regular maintenance/tuning/repairs and restoration or a full rebuild. Thus one of the overriding factors in any appraisal valuation on a piano is the age and condition of the internal mechanics.
Based on the information I have, and assuming that it has not been restored in the last 40 or so years and is probably as originally built, I believe your piano has a value for a private sale in the $200 to $500 range. I am sorry that it is not better news. There are still a good many pianos of this type around and often for sale. If there has been some recent work restoration completed on this piano, please let me know the details and I will reassess the value range if appropriate.
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