Who makes this double

[Schüler Jumbo]

What are your thoughts?

 

[MacJenkins]

Looking at the advertisement photos the breech on that 450/400 looks sleeved with circumference seem line and the barrel engraving line is in alignment with the rib extension.

Correct. I don't think it's a bad way to build a gun, but you normally see it on less expensive guns. It was easy to find lightly used non ejector Merkels in the $6-7K range in the 05-10' years. I think brand new they were only $8000ish if I recall correctly. And they kicked like a mule for a lot of us.

 

[MacJenkins]

What are your thoughts?

Can't tell from your pictures. You seeing a joint anywhere? If chopper lump it would be vertical between the lugs.

 

[Schüler Jumbo]

No, not seeing any joint seams. From what I’ve read the older 140’s were Shoe Lump and the newer 140’s are Monobloc with barrels threaded into the block just like a bolt gun barrel threaded into the receiver. The Monobloc is supposedly less expensive to produce with the added benefit of being structurally stronger. The 450/400 in the add may have been rebarreled although the add description doesn’t state that.