KURTZMANN 1900-13000 1917-61000 1925-86000 1933-97000 1905-25000 1918-65000 1926-89000 1934-97300 1914-46000 1922-77000 1930-96000 1938-107000 Based on this information from http://www.bluebookofpianos.com/serial1.htm, your piano is from around 1914-1915.
that would depend on the condition. are any pieces mising? water damage? has it lived its life indoors? has it had regular tuneups? any internal restoration? does it come with its original bench? is it a grand or a just a square?
What is the value of a C. Kurtzmann upright piano c. 1920?
500
12598