20-120
25-90 usd
Virtually impossible to determine caliber by just the serial number.
You will need the services of a good gunsmith.
Basically impossible to do with just the serial number.
1965.
Rifle or pistol?
Serial 16008
Mossberg IIRC
1988.
Usually caliber and/or serial numbers.
your rifle was made in 1940
Impossible to value a weapon with just the caliber and serial number to any degree of accuracy.