Thanks for the information!
The serial number shows it was built in 1994 in Korea by the Samick Piano Co. "Kohler and Campbell" has been out of business for many years and your piano is an example of a "stencil piano" meaning one company buys the name of a defunct piano business that has had name recognition and then slaps it on their own cheaper piano in order to pass it off as a better product and, in this case, to be American made.
Samick makes many pianos for many different companies in similar fashion to this. Their instruments are on the lower end of quality and price. Considering your description of excellent condition as well as depreciation in value since new, I would recommend a selling value in the current market of approximately $1,800-$2,400. Best wishes!
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