The eyepiece is a typical Ramsden eyepiece consisting of two lenses (A, B). One lens (A) is made of green glass, the other is clear. When assembled, the curved surfaces face inward.
There is also an eyeshade (right) for this optic.
A: Top lens, 2.2cm diameter, f=5.8cm. The glass is slightly green.
B: Bottom lens, 2.6cm diameter, f=5.2cm.
The eyepiece magnification is approximately 5x.
Drawtube assembly showing lower sleeve and upper eyepiece assembly.