Even if you had included the SN, the question still couldn't be answered without knowing the manufacturer and model of the rifle - this cannot be determined by serial number alone, as serial numbers are not unique to one firearm.
1951
You will have to call FN to find out.
No sn data
100-1000 depending on specifics
No published sn data. 50-100 or so
No published sn data. 10-200 USD
can't be done with just the sn.
No published sn data.
No published sn data.
No published sn data
No sn data available that I am aware of.
No sn and no description = no way to answer.