My main experience with Capo bicycles is circa 1960. Otto and company may have subsequently switched to above-top-tube brake cable loops, or, as you mention, those might have been a custom modification. The seat post clamp is also not typical of 1960, but may be a ca. 1965 design change, since the original was kind of clunky, albeit distinctive. I have seen several Capos with the original seat post clamp replaced by a more conventional strap. The lugwork, dropouts, and placement of the serial number definitely shout "Capo."
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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
Last edited by John E; 03-26-17 at 08:06 PM.