Information not available in the public domain to answer.
Only Browning knows.
Browning made Sweet 16's in 1955, however there was not a special Anniversary model made that year. A 1955 Sweet will run in the $400-$2000 range depending on condition.
The gun has 1997 in gold on the receiver.
your browning was made in 1976.
Browning.
Your browning sweet sixteen was made by browning in 1954.
Your browning was made in 1976.
Your browning sweet sixteen was made by browning in 1959.
Your browning sweet sixteen was made for browning in 1922 by FN of belguim.
You have an Amwerican Browning made by Remington for Browning during WWII. It was made in 1947.
Your browning sixteen gauge shotgun was made by FN for browning in 1949.
your browning auto-5 was made in 1956.