The twist barrels have better finish remaining and do not have any internal freckling (the others reportedly do) and they are arguably better choked for clays (mod/mod) versus full/full. The earlier gun (1891, sn-34342) has a bit more drop (but not too-much), with an original dogs-head butt-plate. The shaping of the action is strikingly better than the later gun, and is remarkably different (looks way-less mass-produced). In the photography, I don't see any suspicious cracking in the head of the stock, although the wood is quite darkened near the jaws and I'd suspect it's a bit oil-soaked. The later gun looks like it's ready to go, the earlier gun looks less-polished and more weathered....tough call. Is the damascus materially stronger when compared to the twist?