I've seen them in 12, 16, and 20. The 20s seem to be the least common. A friend who usually uses an 870 takes out his 420 16-bore at least once a year on a sentimental journey. I would say they are comparable to a Marlin Model 90, and probably made to compete with the Marlin. Sturdy, well-made and functional, but, as you say, something of a club. My friend's has a little scroll on the flat sides of the reciever; I haven't examined it closely enough to tell if it is engraved or rolled. Suspect the latter.
