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No such thing as a 22 Shotgun.
No such model number.
Japan, Portugal and Belgium
Your browning auto-5 shotgun was made by FN of belguim for browning in 1957.
Your Browning auto-5 shotgun with the prefix of 70s to the serial number identifies that your shotgun was made in Belgium for Browning in the year 1970.
Your sweet sixteen browning auto-5 shotgun was made by FN for browning in 1963.
If your browning 16ga shotgun is a auto-5 then it was made by FN of belguim for browning in 1927.
Entirely possible.
This is best left to a gunsmith.
The barrel will be marked "Made in Belgium"
It will be marked on the receiver/barrel.
By the serial number.