shotgun help?????

i have a singleshot break open shotgun with 30" barrel and solid wooden forearm and stock. the only markings on the gun are 1) BISON and 2) choke. there is nothing else on it. can anyone help me
 
Does the shotgun come apart? Once apart can you remove the forearm?

Sometimes there a stamps hidden under the furniture.
 
2)choke usually is the same as modern extra-full chokes. I heard if it didn't have choke anywhere on the barrel, it could be a cylinder to a imp/cylinder. Hope this helps.
 
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