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

- Magnification = approx 6x
- Diameter = 22.93mm
- Depth of fit = 27.75mm
- with brass sleeve that adjusts the fit diameter to 26.34mm

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.