Originally Posted by John E

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."