From the information I have at hand the 16 gauge Browning A5 was made in 1938.
That year serial numbers ranged 111001 to 118200. The 16 gauge is a very nice shotgun, should handle well.
If you go to
www.midwestgunworks.com you can find the factory service manual.
In the manual you will find out how to service the gun. Please note the A5 needs regular maintence and should be taken down for cleaning every 10-15 years.
With that being done the gun should serve your greatgrand kids very well.
To say the least Browning A5's are made very well.