I've just got one vintage eyepieces of this type/size as follows:

- Application - microscope - top-hat style
- Magnification = 10x approx
- Diameter = 26.16mm
- Depth of fit = 9.5mm

No maker's name that I can see, but a quality vintage piece.  Needs a light internal clean.

The eyepiece will be well wrapped and shipped by Royal Mail.

Thanks for looking.