100-1000 or more depending on specifics
I assume it is a Superposed. 1959 was date of mfg if so. Any Superposed from that time period that shoots is worth $700-900. Depending upon condition, if paperwork is available, and other bells and whistles, it could be worth several thousand.
12 gauge Belgian Browning shotgun, serial #296305
1951.
1934
What model?
1967
your browning auto-5 shotgun was made in 1947.
This gun was made in 1951
1970
If that is the complete serial number, 1924.
Browning's web site has a sn search function.
$350-$650.
Impossible to answer without knowing which model.