TGo to Browning's website under Support then go to Date your firearm. Value of any used firearm depends upon condition and area of sale. pe your answer here...
Basically impossible to value with just the serial number.
A billion dollars
50-550 usd
No such A5 model number.
50- 550 usd
Impossible to value a weapon with just the serial number and no other info.
50-500 usd
75-575 usd
A5 refers to a shotgun.
100-600 usd
fn a5
A few hundred to a few thousand.