The Prugnat bike parts factory was on the banks of the Canal du Loing in Prugnat, France. In the buildings of thate factory, there is now a museum, the “Bike Conservatory” covering the bicycle from nineteenth century to modern times. As shown below, many lug variations were available from Prugnat.

Updated 7.1.2014

This illustration is from a 1970's Proteus brochure

Lug set which is "earless" and shown options for binder bolt.

Frame builder Brian Baylis marked these for future reworking

Lug set showing reinforced seat post binder bolt