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.
Between 1973-75
You will have to post the sn or call Browning.
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.
W73 to 76 and then to current two letter code
7mm Magnum and 300 Winchester Magnum
your browning sweet sixteen was made in 1934.
that depends on the year of mfg. the code changed frequently