You need to give more information. I assume it is a shotgun, but "Acier Special" just means it was made with "special steel" and we would need at least a model number to start looking for the manufacture date.
1932
Basically impossible to value with just the serial number.
50-500 usd
Basically impossible to value with just the serial number.
The 5G prefix to the serial number indicates that your browning was made by FN of Belguim for browning in 1965.
50-500usd
Acier Special-C.12 Gauge Serial#384034 okg895 Fabric National D Armes Fabrique De-Guerre Herstal-Belgique what is this gun worthy
50-250 usd
Simply means 'special steel' in French.
$350-$850
Go to Browning.com, select customer service, select date your firearm.
Basically impossible to value with no other information.