No such model in the Browning line.
A model 1200 made by Browning is unknown. No such model exists. Winchester made a model 1200 Shotgun, perhaps that's what you are looking for.
What model is the Browning? Get the model & serial # and look it up here. http://www.browning.com/services/dategun/index.asp
The Remington 241 (after the model 24) is browning design and look the same, the 241 was last made in 1949.
There are some picture on the browning web site
Since you did not provide the serial number, you will need to call Browning or visit their webiste to look it up.
The Browning website has production data, broken down by model. Look under Customer Service.
left side of barrel usually
It will depend on the specific model and its condition. A quick look at the GunsAmerica.com site shows Browning Sweet 16 shotguns listed for anywhere from $650 to $2500.
Like hexane model here.
I would contact Browning directly and see if they have any in stock. I would also look at Boyd's rifle stocks and see if they have any reproductions that would fit your Browning.
You will have to provide the serial number and the model in order for any one to date it. Alternatively, go to Browning's web site and look it up under Customer Service.
Value depends on condition. You can look up your rifle in the blue book at the link below