What is the value of my green USO Gulbransen serial?

To determine the value of your green USO Gulbransen piano, you'll need to consider factors such as its age, condition, and any unique features it may have. Typically, vintage pianos can range from a few hundred to several thousand dollars, depending on these aspects. It may also be beneficial to consult with a piano appraiser or check recent sales of similar models for a more accurate valuation.