I agree it is a slide copier. Camera goes on the left, the lens is
placed in the middle attached to the bellows and the slide to be copied
is fixed on the right side. Manufacturer could be Ashai Pentax as a
guess on my part.
Looks , to me, like a device used for examining film negatives to
determine if they are in sharp focus. Can also be used to examine prints
for the same reason.When the device is set on a flat surface does the
glass focus on that surface, if it does, ...