Impossible to answer without a detailed description of all markings, caliber/gauge, type of weapon, type of action, etc..
PROBABLY the P35, or "Hi-Power", from the early 1950's. It was first imported under the Browning name in 1954, so if it has the Browning markings you can pin it to that year. sales@countrygunsmith.net
Your browning was made by FN for browning in 1950.
The 71D prefix dates your Browning to the year 1971.
your browning was made in 1976.
You will have to call Browning
The letters NX indicate that your Browning was made in the year 1993.
You will need to call Browning
Your browning was made in 1976.
You will have to call Browning.
You will have to call Browning with the sn.
You will have to call Browning.
You will have to call Browning to find out.