Some examples include: factory manufacture
"Man", "Manu". Manufacture (build by hand) Manual (Of or pertaining to the hand)
There are many words that start with the prefix manu-.Just a few are manufacture, manuscript, and bimanual.
Could you look and see if there is a prefix letter,or a number letter combination prefix to your serial number?this would aid greatly in establishing the year of manufacture of you browning sweet-sixteen.
The prefix letter shows the year of manufacture. 1956 is letter S
manufacture date of the python is based on serial number.....................
1989 was date of manufacture for the VL prefix.
With the prefix of E its was made in 1983
"AD" prefix indicates 1967
K prefix indicates 1950 manufacture.
If your Marlin has a AB prefix to the serial number,then this indicates that it was produced in 1966.I do not show a single B prefix in my records.
With the prefix 80BS, my guess would be some time in the 1980's. The records I have only go to 1978 with the prefix 70BS.