Gatsby is correct, I used to own the gun.
I collect Holland double rifles and have a pretty good feel for them. I am 99.9% sure this gun is exactly as described. George Caswell told me he was 99% and I did not believe it until I received it. The wear on the coloring is worn exactly where you would think it should be.
The barrel length is exactly what the Holland Ledger page says and the weight is exactly the same as well. A normal shotgun of this caliber would have 36 to 42" barrels. The charge is 10 drams, no shotgun used that much powder. The gun has an extended top strap which only their rifles had. The bores are exactly the proper dimension, not waivering one thousandth throughout, .832 as proofed.

Comparing this to a Paradox which has the rifling removed is ridiculous.
JZ