Korona Cameras, Gundlach-Manhattan Optical Co. (Rochester, NY),
1903, p.27
Notes: Gundlach-Manhattan chose to advertise two very similar, but differently named, models of camera in 1903, the Korona VI Special and the Korona Royal. The only difference between the two is that the Special has a rapid rectilinear lens and the Royal has an anastigmat lens. Why this was thought to constitute a different model name and 2-3 additional pages of catalog is a mystery. By 1906, only the Royal model remained, but could be had with any of several lenses, including rectigraphic or anastigmat. There; was that so hard?
References:
Korona Cameras, Gundlach-Manhattan Optical Co. (Rochester, NY),
1903, pp.27-29
Not in the 1906 catalog.