1.6″ (40mm), F 700mm, Altazimuth Refractor, 4x 19mm Viewfinder, 3 eyepieces, Star Diagonal, Sunglass; additional options available include Sun Diagonal, Erecting Prism, Barlow Lens
These first photos are of what I believe to be one of the earliest Nihon Seiko 42mm/700mm models. Photos were provided courtesy of Sheldon Faworski:
And the very early Nihon Seiko Catalog:
The model featured is owned by James Witt: