I've bought a few NOS filters cuz I thought they made interesting items in my display case. Painted logos, chrome plated filter cases, stylized product boxes...them things are all a thing of the past with the advent of laser printing, zinc plating and generic packaging.
These filters have leather & cork seals with paper elements. The leather & cork are not flexible, neither are the paper parts, so I reckon they would not be as effective as a filter with newer materials. I'd say that leather gaskets were obsolete, but Colorado Rawhide still sells 1-ton pinion seals made of that organic matter, complete with correct seal material preparation instructions.
I did some valve adjustments on the '48 years ago, and used some NOS cork valve cover gaskets...those decades-old cork gaskets eventually fell apart, so I replaced them with some newer-style rubber gaskets. But it was a messy lesson to learn. I see the NOS stuff up for grabs for some good $$$ and all I see are display items or someone's future messy lesson