I agree there's nothing too distinctive about the frame, but the extremely long chrome plated concave seat stay caps are a little unusual.

Also, the fork crown pretty obviously has cast plugs for the securing the blades (the blades are fitted over the plugs and brazed) giving a clean, light appearance. I've used sloping crowns with plugs (Cinelli type, picture below), but this one with a flat top is particularly elegant to my eye.