If vintage means out of production, Mcintosh XR290 or more recently Snell A7 phantom. If you mean before the 80's my Concert Grands supplemented with Celestion super tweeters are still my favorite. Tri-amped. Small speakers, AR3a, Mcintosh Ml-1c. Esoteric speaker. KLH 9. Pre 70's speaker, still my Concert grands, though I owned Symphonys at the time. Non Bozak from the 60's, Altec Carmels and AR-3.
The speaker I dreamed about but couldn't stand the sound. The speaker I knew If I owned I would make right to have the rest of my life. JBL. PARAGON.
Its like falling in love with an old Maserati or old Jag from the 60's knowing you would have to install a small block V-8 from the US to make them perform and provide dependability. So its the same for the Paragon. Replace the Bullet tweeter with an Altec 950 UHF ring radiator, The midrange driver with the driver from a DD67000, and the Best 15" woofer JBL has to replace the 140 in the Paragon. Throw in mini DSP processors and bi amp and a new world of discovery would be achieved. I just know it. But then again maybe a mini DSP would all you would need to start with. Though that bullet tweeter was horrible.