10-1000 USD without a better description
100-1000 USD depending on EXACTLY you have.
@ 1912
about 1919
about 1921
about 1926
about 1936
1937
Proofhouse.com has Colt sn data.
A Colt hammerless .25 with that serial number was made in 1925.
A Colt 1908 hammerless .25 with that serial number was made about 1912.
1909
1916