If you need a spot meter with an optical viewer, that gets you into a different size; there aren't many that have incident and an optical-spot system, so unless you're doing serious zone system stuff, think about it carefully as those are pricey meters. You can get a used pistol-style spot meter fairly affordably these days (for spot metering with flash, the price leaps back up).
If you want a pro-caliber incident meter with flash and ambient, another vote here for the Sekonic 308 - I've had mine for 2 decades now, they're still made, they're about the size of a deck of cards, very simple but most everything you need. They even do flash metering without a cable so they're really convenient. Under $200.
I'd be wary of anything really antique or "vintage" unless you have a good meter to test against.