Just bought a Nishiki Custom Sport Mixte for $20. Serial number KC 20025. It needs a lot love as it looks like no maintenance was done since 1983 but I think I got a deal.
Frame: Nishiki Tange double butted chrome - moly
Fork: Tange 3.I
Handlebars: Winpista road
Brake levers: Dia compe non-aero 0983
Stem: Winpista
Shifters: Sun tour stem mounted
Brakes: Dia compe N 500 0883
Cranks: Sugino RT 165 mm 2 GC
Pedals: SR P-466
Derailleurs: Sun tour AR front: ZE rear: ZH
Freewheel: 6 speed
Wheels: Araya 27 x 1 1/4
Hubs: Sunshine 5345
Saddle: Avocet touring
Seatpost: fluted aluminum SR Laprade