Now I have a question. I have recently picked up a NOS Sugino Aero Mighty aero shaped seatpin marked for Tange tubing. I presume this is from the early 1980s but which tubing set. I have come across Columbus aero shaped seat tubes ( a Condor I have uses a Columbus aero shaped seat tube and a Mercier I have has another I can't remember which aero seat tube and pin). But neither are the same as this.
Hilary Stone