Here is the deal. While both of us are somewhat new to vintage Marlins, and various details, between us, we have some 70 years of serious gun collecting background. Myself over 30, him 40, if not more. Either of us can tell the difference between a carbona, versus rust, versus caustic blue from across the room. We can tell when a gun has been monkeyed with. We can tell when sights have been replaced, when stocks have been refinished, etc etc.
Even if this barrel had been shortened 1/4" that would still make it a 25 1/4" odd number length. Not 26, not 24. I have gun smithed on a professional basis until recently for much of 30 years. My mind thinks in thousanths, I can read a tape measure, and know the difference between 24 and 25" ;D
OK, the crown does have slight chamfer, about 1/32 inch width. The gun may have been dropped, and a countersink removed the dent, that is very feasible, it does not mean the barrel has been whacked. All wear and color on the whole gun, is consistently even.
OK, its a round lever, just what purpose, did rancher John, have to remove the "tail" from the lever near 100 years ago? And maybe it was replaced, for what purpose, I have no clue. The whole gun sports 70% maybe more original finish. The bore appears literally new and perfect. If the gun was beat to dog crap, a lever might have been replaced, but again, none of the evidence hints at any need to replace the lever.
That the rear sight is not typical, also suggests a guy with some extra money to special order stuff, as the sight for sure is similar vintage, and matches the rest of the overall minute bit of patina.
I have an 1893 with 28 1/4" barrel, full length with a Kings semi buckhorn rear, and a Kings 3 bead front, both match wear and patina. Along with the special barrel, I have no doubt, the sights were ordered with the rifle.
Thanks for all the ideas, Ron