Frosty
SOH-CM-2022
It was rare for combat aircraft to have been buffed to a high polished shine. We can get a false impression from Airshows and Museums that they all had pristine finishes that gleamed like a mirror. In reality the bare metal finish aircraft quickly turned somewhat flat from exposure to the elements as the aluminum took on an oxide patina. I've researched a fair number of period photos and the large majority did not look like the show planes of today. The effect I do see is that even with a flat aluminum finish you can have pronounced specular effects and a mirror look if you view the surface from a very shallow angle (this is an optical effect for most surfaces determined by physics).
I agree with you on the 'mercury reflectiveness' on some of the aircraft. Especially the painted ones. Paint was meant to hide the aircraft, so except for those high gloss Navy jobs, most aircraft (or at least their painted surfaces) should be rather little or non-reflective. Not to mention the toll that day in, day out flying took on the aircraft. They probably didn't hose 'em down after every mission.
But you gotta admit that even the most skillfull skinner can't do for a 'bare metal' model what the latest developments do! Now it's a matter of finding the right balance...