Belgian proofmarks, year of manufacture, barrel inscription. == ==
The barrel will say where it was manufactured
Call Browning, give them the serial number, and they will tell you the age and a host of other information about your gun.
take it to a gunsmith
It will be marked "Made in Belgium"
Probably 1966. Call Browning to verify. Can't value with just the serial number
The barrel will be marked "Made in Belgium"
The barrel will have 'Made in Belgium' on it. The receiver can be dated by serial number.
It was made in 1953.
Comparison to known grades.
The barrel will be stamped "made in belgium" or "made in japan".
Serial number. Go to Browning's site, click on support, then date your firearm.
This gun was made in 1964. Use the link below for values http://wiki.answers.com/Q/What_is_the_value_of_a_Browning_Sweet_Sixteen
By the serial number.