Hi Martin,
It's been a while ...
White names the Minicord lens his favorite amongst DEFUNCT cameras. But he goes on to say: "In addition, the two best subminiatures
CURRENTLY available [as of his 1990 publication date], with lenses as high in quality as those on 35mm cameras, are Tessinon, 1960,
Tessina, f/2.8, 25mm and Robot SC, 1987, Xenagon, f/5.0, 30mm." (p.159; William White, Ph.D., Subminiature Photography, Focal Press,
Boston, USA)
So I think your claim that the 'Goerz Helgor' is White's number-one lens is off-base. You're taking his ratings out of context.
Marc