Are you going to nickel plate the sight?I'm like Swany, as even though I have a lot of Marlins to choose from, the little '53 39A is what I enjoy shooting the most.
However, the recently acquired nickel plated 1897 when I get a peep sight on it, may give it a run for the money.
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I was just kidding about it, but it should look good clean and clear coated. I would leave the eyepiece black.I'll probably try wire brushing it down & clear coating it as I am afraid that plating it might screw up the tight tolerances.