The eyepiece has two biconvex lenses placed 1.4cm apart. Individually their specs are:
Front lens: dia=1.6cm, f=3.4cm
Back lens: dia=2.3cm, f=3.7cm

Together they have an effective focal length of 2.0cm.

The only objective with this instrument is a very low magnification lens labeled "7": dia=1.4cm, f=13.5cm. It is biconvex. It was probably used as a single magnifier.
The field lens is mounted to the top body piece. It is plano-convex, dia=3.5cm, f=7.5cm.
Optical layout

A: Eyepiece pair

B: Field lens

C: Objective with 8mm aperture