(not mine)
No Reserve: 1960 Rathmann Xterminator Twin-Engined Go-Kart
https://bringatrailer.com/listing/1960-rathman-xterminator/
Bring a Trailer is such a racket. It's amazing.
That said, I wish I had bought up all the GEM parts from our local track 20 years ago. It's gold now.
I watched a Honda four stroke go by at a reasonable price last week, but mostly the BAT stuff gets way overbid.
They charge 5% on top of the sale price as well. My boss bought a March Formula Ford and was pissed when he realized there was going to be $4k of fees on top of the car price.