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your browning shotgun was made in 1963.
Your browning 20ga model auto-5 shotgun was made by FN of belguim for browning in 1962,with the serial number provided.
this gun was made in 1964
1967
for belgian guns, the serial # that would start 76X xxxx "X" stands for Magnum 20ga. auto5man
In order to date your Browning 20 gauge shotgun you will need the prefix to the serial number it should look like a number followed by the letter Z.or 2 numbrs followed by the letter X.
The 7X prefix indicates that you have a Browning auto-5 shotgun in the magnum 20ga model that was produced by FN of belguim for Browning in 1967.
My answer would be no.Browning never used a K prefix to the serial number on any model of their shotguns,let alone the 20ga models.
100-1000 or more depending on specifics
No way to answer without the serial number
your browning model auto-5 shotgun is valued at between 375-650 dollars.
This gun is not a Superposed model, but a Citori 425 in 20ga. It was made in 1996