A staple of the Browning line since the 1930s
Your Browning superposed,over under 20 gauge shotgun was made in the year 1951;with the serial number that you have provided.
Browning Citori 12 gage over and under & a Browning Goldtrigger Light Twelve: How much are they worth?
No such model designation.
A Browning over and under is worth about $1,000-1,500 on it own and the fact that it's a Belgium made Browing increases the price significanly. I would say somewhere in the range of $500 to $750 more. The belgium made Browning is the most collectible and popular.
You will have to contact Browning and order a history letter.
Browning.com has sn tables under customer service.
Best left to a gunsmith.
If your over under shotgun was made prior to 1964,then the model of your Browning shotgun should be named the superposed.
Browning offers letters now for @ $40 USD
A Bar is not an over under, and what do you mean by tooling master?
40891 s5