I'd definately date the building to pre-1920's just from the shape of the windows. That arch, at least around here, would indicate something late 1800's-early 1900's to me. Could be wrong though. Very interesting indeed. With that being a bike boom era, theres so many manufacturers it could be... however that slogan makes me think it was one of the larger more established makers. The building could also be older than the sign I suppose.