Car appreciation... the aesthetics, the engineering, etc

Is it a bad time to buy a classic car?

Depends on what it is, and how much it will cost. Huge uncertainty right now, but that Covid-19 will lead to some sort of recession is accepted, the question is how deep and how long.

Classic car pricing typically dives when economies tip into recession, but if the seller is doing you a smoking deal today/there's only one of them in the world/you proposed to your now wife in this one then it may make sense.