The Capo Modell Campagnolo was only $20 at a yard sale. Having owned one previously, I knew what they were. It lacked the original Record hubs and cottered cranks, and the Gran Sport front derailleur had worn out, but it had a nice set of Nervar Star cranks and original gear levers and brakes. Since the frame was undamaged, it was a no-brainer at that price.
Capo Sieger -- this was a lot more of a splurge, but it was almost 100% original, and I knew it was the rare top-of-the-line model. I have since seen two in crummier and less complete condition sell for $2K and up on eBay, so no regrets on that one, either.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069