You will have to contact FN to find out.
Impossible to value with just the serial number.
about 1920
How value is Browning 300 Win Mag Semi Automatic
No way to answer without a detailed description.
50-500 usd
0-1000 uSD
50-400 usd
50-500 usd
100-800 USD
In good condition about $500
50-500 usd
Don't know the value ,but a Colt 1908 hammerless .25 semi-automatic with that serial number was produced in 1921.