Anywhere metal, usually along barrell or near receiver, it varies a lot between makers. If very old, MAY not have one at all.
You will have to call Browning with the serial number.
Your Winchester model 1890 .22cal rifle was made in 1917 with the serial number that you provided.
Your winchester model 1890 .22cal rifle was made in 1904,with the serial number that you provided.
With the serial number that you provided,your Winchester model 52 rifle was produced in the year 1928.
Impossible to answer wihtout a serial number.
With the serial number that you have provided,your Winchester model 63 rifle was made in the year 1948.
Call Browning or check the serial number on their website if it is up.
Look on the receiver
If its a long string of numbers its probably the Serial Number of the rifle. This is an identifying number, unique to that rifle and that rifle only. When the rifle was issued to a soldier the Serial Number was written down in the records, and he was responsible for returning the weapon when he left the service. Individual parts might have a number stamped on them, having to do with the production of the rifle.
With the serial number that you have supplied,your Winchester model 1890 pump action .22cal rifle was made in the year 1912.
With the serial number that you have supplied,your Winchester model 1890 pump action .22cal rifle was made in the year 1928.
Your Winchester model 1890 pump action rifle was made in the year 1927 buy the serial number that you have provided.