You will need to include a serial number to have your question answered.
Browning.com has a sn function under customer service
1970
Browning's web site has a sn search function.
You will have to post the sn or call Browning.
Between 1973-75
Browning has sn data available on their webiste under Customer Service.
Your browning sweet sixteen shotgun dates to the year 1954 with the serial number that you provided.
You did not provide the serial number. You will need to call or visit the Browning web site.
your browning sweet sixteen was made in 1934.
7mm Magnum and 300 Winchester Magnum
W73 to 76 and then to current two letter code
Marketed as the B78, this gun was made in Japan from 1973 thru 1982. The model was reintroduced as the model 1885 in the year 1985