The stage is a solid brass rectangle with a circular cutout. The three attachments, two slide clips and the bull's eye lens, clamp to the stage.
The stage attaches to the focus mount via this dovetail.
Class insert for the stage cutout.
Below the stage is an interesting set of aperture discs. The top is a series of holes. The bottom is a slot. Sliding the two together produces a spot of transmitted light at different positions along the stage.
Bull's eye lens for illuminating opaque samples.
Two-part substage aperture; top.
Substage aperture, bottom.