Try Proofhouse.com
No serial number given.
about 1913
about 1905
The Colt Bisley Model in .32 WCF with serial number 257473 was manufactured in 1910. Colt's serial number records indicate that production of this model occurred primarily between 1894 and 1915. For a precise year, you may want to consult Colt's official records or a reputable firearms historian.
Based on proofhouse.com ,that bisley was made in 1913.
Based on proofhouse.com ,it was mfg'd in 1906
That Colt frontier Bisley with sn 282698 was produced in 1906.
Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
A Colt Bisley with that serial number would be 103 years old having been made in 1907.
On the frame
Made in 1911.
Nearest I could find with that serial number was a single action army & bisley (pre war ) made in 1895.