1795-1870 or so
The fixed choke markings are denoted by * marks on the bottom of the barrel under the forearm assembly. 3 on the left barrel and 4 on the right. *** Modified choke **** Improved Cylinder
Without knowing the maker or the markings on the barrel/breech, you can't find out anything. Even then, there may be little to no information.
You will need to provide a DETAILED descripton of ALL markings, gauge, barrel length, forearm, butt stock, etc..
The Benelli Supernova does not come with a damascus barrel as a factory option. However, some custom gunsmiths may offer aftermarket damascus barrel options for the Supernova.
To attach a forearm to a Stevens 940E shotgun, first ensure the shotgun is unloaded and safe. Remove the barrel by unscrewing the barrel nut, then slide the forearm onto the magazine tube. Align the forearm with the barrel, reattach the barrel, and tighten the barrel nut securely to hold the forearm in place. Always double-check for proper fit and function after reassembly.
What are the markings on the gun? sales@countrygunsmith.net
No reference lists J Manton.
27p
A damascus barrel is a barrel made of damascus steel, which is steel produced by hammering two different steels together. The twist refers to the pieces of steel being twisted while they are hammered, which produces the distinctive pattern on the steel.
You don't.
Not.
Damascus barrel (in French).