BJ:
Made in Brasil by Companhia Brasileira de Cartuchos, actually had a look at one in my gunsafe (a .410 shotgun) and they do have a hammer, but partially enclosed. I looked for the range of chamberings on the web, but not much about them is forthcoming. They are common and popular in Australia, probably equal to Baikal, especially as cheap 12-bore single-barrel shotguns. They also make a strong no-nonsense centre-fire single-shot rifle.

Oh, and they are the makers of Magtech ammunition.