This marks the first appearance of the derailleur that I know as the Sanko Procyon PV-III, with its variable rate spring. However, the derailleur names listed below the main text seem to be:

• Sanko Procyon
• Sanko PF
• Sanko PA
• Simplex Prestige type P
• Simplex Prestige type N
• Simplex Criterium.

No reference is made to any ‘PV-III’ part of the Procyon name.

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• Publisher: New Cycling
• Country: Japan
• Date: April 1967
• Derailleur brands: Sanko, Simplex
• Derailleurs: Sanko Procyon PV-III, Sanko PA, Sanko PF, Simplex Prestige