I would say that any air gun manufactured before the advent of the internet and the affordable chrony qualifies as vintage. Choose your date. In my opinion, the internet ruined many things, including air guns. Before the rapid dissemination of misinformation and unfounded opinions, air guns were bought and sold by the reputation of the manufacturer.
Since the aforementioned rapid dissemination of misinformation and the cheap chrony, air guns are bought and sold by muzzle velocity. It is an easy measuremnet to take, but it actually reveals very little about a gun's character or shootability. Some say more information is better, and I tend to agree.
But not when a good deal of that "information" is repeated falsehoods and hear-say. Before the affordable chrony, people would speak mostly about accuracy, and power was limited to how many sides of a tin soup can it could penetrate. And that was good enough for air rifles.
Nowadays every time I want to sell a gun, I need to take it to my friend's house and run it over a chrony to get numbers. Buyers seem to need this info. Why, I still don't understand. I don't own a chrony, and probably never will.
When I mess with one of my guns. my goal is always smooth firing behavior and repeatable accuracy. I actually don't care how fast the pellet goes, as long as it goes EXACTLY where I want it to go, time after time.
Sorry for the rant.
I think we're all Bozos on this bus.