Beautiful gun. Stunning color casing. Rare to see it in such nice condition.

I have a 39 from the 1930s, identical to yours except for condition. It, too, was made prior to Marlin beefing up the bolt for high speed ammo. I only use target and subsonics in it for that reason. Unfortunately, the color casing is fading and is not vivid, though it is still there. Worse, there is some nasty pitting on the barrel in spots, and I doubt draw filing will bring it out. So I keep it oiled and shoot it as-is. It's a shooter grade, not collector grade.