The estimated value for a used Wissner piano model 60826 in good condition is between $2,000 and $5,000, depending on factors like the piano's age, maintenance history, and any restorations or repairs done.
However, it is important to note that the value can vary based on the specific market and region where the piano is located, as well as the demand for that particular model.
To obtain a more accurate estimate, it's advisable to hire a professional piano tuner or appraiser to assess the instrument in person.