Several features (the 3-slot BB shell, Campy 1060 Vertical DOs, those headlugs and the "Dutch style" seat cluster) sure are things I've generally only seen altogether on Brit-built frames, BUT could be a kit-built from something like Proteus...If I had to make a guess I'd pick one of the marques that did similar "milling" of the BB shell, but none are a slam-dunk match.