[Brightcolours]

Dave, I have found no real info yet. No idea in which machine kind/model they were used, no idea on the actual intended format and related to that, the distance to the image plane is also an unknown. They are a wide open only lens (so no adjustable aperture), and indeed are compact. "filter size" about 64mm, and the barrel length is 57mm. The used mounting plates have a 111mm diameter. Now you can have a sense of scale.

Maybe it was used in a copy machine like this:
https://www.konicaminolta.com/jp-ja/news...-01-02.png
(U-Bix480 from 1971)

A copier like this would at least be able to copy A4 (about 21 x 30cm), so 8" x 11.8"