Tubular tires
Raleigh Professional (I’ve owned three; just didn’t do it for me)
Peugeot PX-10 (I’ve owned four; just didn’t do it for me)
Campy NR RD (great if you like really narrow range and loud friction shifting and cracked pulleys)
Quill pedals and toe clips (ouch!)
low-trail geometry (too floaty)