A semi-automatic shotgun.
if you are asking about a browning auto-5 shotgun?The year of production of your browning shotgun is 1928.
Fully automatic shotgun, no. Automatic rifles and machine guns, yes.
It is the lightweight version of the Browning Auto-5 semi-automatic shotgun.
With the serial number that you provided,your Browning auto-5 12 gauge shotgun was made by FN of Belguim for Browning in 1947.
It is the the Auto 5 Semi Automatic Browning shotgun. Named for the shape of the receiver that is unlike most any other brand of shotgun.
Most likely an Auto-5
in the year 2012