This August 1966 Sanko advert marks the debut of the Sanko Procyon PV-I (although it seems to haver been called a PV at the time). It’s cable clamp mechanism and pulley cage plates also appear to be slightly different from those of the example in this collection.

• Publisher: New Cycling
• Country: Japan
• Date: August 1966
• Derailleur brands: Sanko
• Derailleurs: Sanko Procyon PV-I