Can still be special ordered.
The .410 Browning A5 is an urban legend. Browninig never produced a .410 A5. No
It was made in 1949.
This is a 12ga. made in 1937
Your serial number indicates that it was produced in the year 1951.
1967
No
What_is_the_value_of_a_Browning_Sweet_Sixteen
Up to 1975. A few were still made in Belgium in 1976 when A5 production shifted to Japan.
Matt Eastman's book on Browning.
This gun was made in 1961
see the Browning website
Impossible to answer without the serial number.