browning 2725
A Browning Auto 5 Lightweight shotgun was made in 1957 with that serial number on it.
You will have to call Browning to find out.
1977
No serial number provided
It was made in 1965
You must call Browning with the serial number to find out.
1966
Impossible to answer without a serial number and detailed description.
Receiver
See the Browning website, under Customer Service. They have some serial number data available.
Your serial number indicates that you have a Browning auto-5 standard shotgun in 16 gauge,that was made in the year 1953.