Sears model 200 is Winchester 1200 try your local gunshop.
Jack First Gun Parts Reference is a three volume set that costs about $40. If they do not have the part they will make. They are the best for old firearms. http://www.jackfirstgun.com
This is really a Winchester model 1400.
I have a fairly complete selection of parts for this model. repair@countrygunsmith.net
There are a few places where one can find a turkey choke for a Winchester model 1400 20 gauge shotgun as of 2014. These can be purchased through local gun dealers, gun auctions, gun classifieds, and through the manufacturer.
The sears model 200 is a Winchester 1200. That will make it easier to find info. I have one of these, with adjustable choke and vent rib. It is a sweet shooting and smooth little shotgun.
I have one of these and have never seen another
273.2310
I have a shotgun choke bored dec.11,1900 with mound city arms that is all that is one it where can i find out about it
Proofhouse.com has a store brand chart. Once you find out who made it and what it is (rifle or shotgun) a value can be estimated.
No
You will need a gunsmith to find out
they take the same chokes as the remingtons these are easy to find.