I will assume that your piano has been fairly regularly tuned and except for tuning and the associated maintenance with tunings it is essentially as originally built. If it is any different please let me know and I can then asses if it changes the valuation I have given.
From the maker’s records the serial number gives a year of build for your Piano of 1930, so it is in the order of 86 years old.
Generally Pianos have a limited life span of around 60 years mainly due to the wear during use and natural deterioration of the mechanical parts over time, such as the action, the strings, the soundboard, the tuning pins, the pin block, etc. The life of these instruments can often be extended by careful regular, usually at least annually, maintenance/tuning/repairs and some restoration over the years or a total re-build/restoration of the major mechanical components. Thus one of the overriding factors in any appraisal valuation is the age and condition of the internal mechanics.
Based on the information I have, your Kimball Baby Grand Piano now has a value in the region of $1,900 to $2,400 for a private sale.
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If you are disappointed in the value given ‘please do not shoot the messenger’, I can only give you a value based on the current markets and a reflection of the same or very similar sales. Owners of musical instruments often have a very sincerely ***** ***** that their ‘pride and joy’ is particularly valuable and sometimes it is, but musical instruments unfortunately generally depreciate with age and/or changes in technology. Many thanks and if you need any more help or explanations on the value I have given please contact me before you complete the rating.