Impossible to answer without knowing who made it.
In order to answer your question,you must include the Make of the shotgun,the model number,and serial number.
how old is a national firearms 12 gauge shotgun serial number A23163
255920
87 years old.If you have a 12 gauge shotgun then it was made in 1906,if your shotgun is a 16 gauge,then it was made in the year 1919.
That is a very early serial number!If you have a auto-5 12 gauge shotgun,then the year of manufacture is 1904.If you have a 16 gauge shotgun,then the year of manufacture is between 1910-1912.
In order to answer your question correctly,I would need to know the model of Winchester shotgun that you are asking about and the serial number of the shotgun in question.
If your browning auto-5 shotgun is a 12 gauge then it was made in 1927,if you have a 16 gauge shotgun it was made in 1934.
Check your serial number,you have to many digits.
You will need to provide a little more information.Please indicate what type of Browning shotgun that you have,and what gauge your shotgun is in.
Your serial number indicates that your Browning auto-5 16 gauge shotgun was made in the year 1948.
the shotgun you have is a 16ga if the serial number prefix is 8R.This would put the production of your shotgun in 1958.If you have a 12 ga.then the prefix would be 8G.please check and make sure you have the correct gauge,and serial number prefix.
If this is an Auto 5 model, it was made in 1929