Great old speakers that are as good as new ones

Snell Acoustics Type AIIIi. I had them for 20 years, until I replaced them with Snell XA Ref towers. They are one of the classic all time great speakers, and a good used pair can be had for under $1,500. One would need to spend 10 times that to get anything comparable new today.

Spica TC-50 and the Dahlquist DQ-10

Celestion SL-600 and SL-700

I have a pair of Snell TypeC/i that I picked up for free with rotted woofer surrounds and a detached woofer magnet. I fixed those problems and they now sound incredible! They are in my main system while I rebuild my Infinity crossovers.

The best speakers I've ever had however, are Infinity RSIIbs. As good as any new speaker I've ever heard.

There are many old speakers that sound as good as very good modern ones.
They might be less neutral but that does not mean they are not as good-just that you have to take more care with amplifier and cable matching.
Gale 401a speakers are fantastic by any standards.They even look thoroughly modern.There is nothing old sounding about their sound either.NO modern sounding speaker betters them for bass quality.They are amplifier fussy but really work well with something like a 70 watt modern tube amp like a Ming Da EL34 AB.