NIB/NOS Rino Excel Cambiogear Groupset: Bizarre Expanding Chainring - 16 Speed - Graphite - 1980's USA Made

And now for something truly different! It was associated with Cambio Rino of Italy but made and designed in the USA by Excel in 1983.  It never saw mass production as the company went out of business the following year. 6000 groups were made for an...