You will need a professional appraisal
Impossible to tell from just the sn. if you found the serial number, you will be able to find the caliber of the pistol somewhere carved in the metal.
Impossible to answer without a detailed description of all features, finish, box, papers, accessories, caliber, type of action, sights, grips, etc..
Can't tell the caliber from just the serial number.
@ 1884
Rifle or pistol?
No way to answer without the serial number.
100-10000 USD
1911
Small inexpensive pistol
@1914
50-400 usd
@ 1972