If that barrel is a Ken Briesen barrel is is a good one. Ken is from Western NY and was a sought after barrel maker. I can remember going to Friendshp to visit with Ken and Bass on the slug gun line. Ken was trying to retire from barrel making. He would announce the was retired and over the day 3 or 4 guys would come up ans say I know that you are retired but could you make me one more barrel? He would relent and drliver the one more barrels and sure enough some one else would turn up for one more barrel. It took him 3 years as I recall to retire.

40 Rod

I was able to go through Dixie Gun works last month. In there used guns a real nice Ken Briesen underhamer slug gun.  Drolled over it but don't need another sport.  Nearly 50 years ago used to shoot a H&A Numrich underhammer in our local muzzleloader matches. All I could afford on a paper route.  Always partial to the underhammers.

Boats

Most of Kens barrels are stamped with his name, a barrel number, date, and calber. I have one in .338 that i super accurate and one in 40, the 338 is marked but the 40 is not as I purchased it as a round blank from a good friend who had ordered 10 blanks from Ken a long time ago. This 40 was his last one in stock, but like everyone is saying maybe not Kens last one. They are very well made, as are other custom barrel makers such as Darr. Barry Dar made greta barrels to.
Mike

Hey Mad Mike, go grab it. I'm broker or I would.