I have just the Frankenbike for this thread...
Peugeot UO-14
Front wheel: Maillard/Matrix from an old Trek 620
Rear wheel: Matrix rim from same 620 built on to an AW 3speed hub with 14 & 24 cogs
Shimano crank & Light Action RD
Shifters: SunTour Power Thumb & S-A trigger
Japanese post, stem & bar
Dia-Compe levers & Mafac Racer brakes
Kenda 27x1-1/4 knobbies
Avocet saddle in photo (now a tan suede Italian)
This machine is just awesome for bombing down the rail trails and dirt roads.