Interesting. The breech looks too small for a cartridge or shell, but I don't see where there is spot for a flint or percussion cap and the hammer? does't seem to hit anything unless it's a cocking level that has something internal that sets off the powder charge.

It certainly looks well made and I'd love to see one in person and see how it works in more detail

I have become addicted to English hammered shotguns to the detriment of my wallet.