The serial number 300221 indicates that this Wurlitzer piano was manufactured in 1928.
Value:
The value of antique pianos can vary greatly depending on a number of factors, including the specific model and condition of the instrument, as well as the current market demand. Generally speaking, Wurlitzer pianos are highly regarded for their quality and craftsmanship, and can fetch a higher value than other brands.
Based on the information provided, it is difficult to give a precise value for this particular piano without a proper appraisal. However, as a rough estimate, a Wurlitzer piano from 1928 in good condition could be valued anywhere from $1,500 to $3,000.