Belgium 20 ga A5's will have a number and letter together before the serial number such as: 0Z - 8Z and 68Z-70Z for lightweight guns 7X and 68X-76X for 20ga Magnums These numbers plus a letter shows it was made in Belgium. Ther are a few other exceptions, but if you wish to find the origin of a specific gun, ask your question with a serial number included.
All Brownings have serial numbers.
Comparison to known serial numbers.
You will have to call Browning.
The earlier the better. 1 is in the Browning Museum.
1981
You will need to supply the serial numbers to your shotguns to get the age of your browning shotguns correctly.
The suffix of M71 was assigned to the Browning model BAR(Browning semi-auto rifle) which was made in the year 1971 in Belgium for Browning.
Please provide the model information. Serial numbers were sequential by model only.
50-500 usd
1975
Call Browning
This would be a Browning BAR semi-auto rifle