Objective lens (L): Bi-convex; dia=13mm, f=16mm. The support mount is Lignum vitae.

Eyepiece lens (R): Bi-convex lens, dia=25mm, f=23mm. The lens is mounted within the ivory top piece.

This lens has been hand-trimmed to (apparently) fit within the ivory eyepiece.
The microscope body tube is 20cm in length. The field lens within the body is placed exactly between the eyepiece and objective lenses.