26 3/4" is such an odd length that it alone is a give away. 26, 28, 30, 32 and later metric lengths like 700mm/27.5, 750mm/29.5" are normal barrel lengths. A single maker I knew of made 27 and 29" barrels as a way to get them lighter than the more often seen 28 or 30" barrels. The chokes are reversed and such open chokes to boot. Measure the barrel wall thickness to make sure it is thick enough to have them threaded.
It is clearly not original and as such only your wife should complain about what you do with it. Bend it, shape it, cut it, tube it if you want. Just understand that it is what it is. A short barreled gun that may become your money pit. we all get one of them if we are lucky. Getting your money out of it later will be almost impossible. But you have complete freedom to alter it to your needs. If you like the dynamics of a short barreled gun, if it balances nicely, if you shoot it well and like the looks of it keep it and fix it to your needs.
