Note Dons derailleur is of a 3 rd variation I have not seen before. Looks like this unit had many steps in its evolution. This unit uses two of the same pulley (Benelux?) while earlier ones had one each Cyclo and Benelux. Later one uses stock Campagnolo pulleys with large aluminum washers as chain guides
BOB FREITAS
blue skies today for a change in MILL VALLEY, CA USA