Nice. I have it's slightly older twin, s/n E 43xx, also Finn marked. If you can live with it being filed don't change the front sight blade. As you know this is a Finn mod so it will shoot to POA at 100yds, which is exactly what mine does with military ammo. The numbers you mention above the current s/n look like old serial numbers to me, mine has them too. I think some if not all 7.35's were made by rebarreling 6.5's so that may well be what they are. The odd reddish tint on the bayonet blade is whats left of the original finish. Years ago I had a fixed folder in mint condition with the same color finish on the blade, unfortunately I lost it an a fire along with a very nice Kragicon, a Trapdoor carbine, my first Luger and an 1859 Sharps carbine.
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