There is probably a letter above or preceding this number. It would need to be identified to give an answer. The only A5 to have these numbers alone was made by FN and sold outside the US. It was made in 1913, and the barrel will have the markings "acier special".
how old is the browning shotgun with the serial number 8G 12882
You will have to call Browning and provide the serial number.
No serial number = no way to answer
No serial number provided.
You will have to call Browning with the serial number to find out.
You will have to call Browning for an answer.
Your browning shotgun dates to 1929 with the serial number that you provided.
You did not provide the serial number.
No serial number provided.
No serial number given.
No serial number provided.
No serial number given.