Unitron mounting flange for either the 60mm or 62mm models - I am not sure, in fact it might work with both lenses. The threads are in good condition.
I know it's pretty obvious, but just in case you are among the clueless when it comes to telescope parts (not too likely if you are viewing this ad, although it does happen): this piece would be normally attached to a telescope tube and it is designed to seat an achromatic doublet threaded into it. That is all it does - no glass or other pieces. You will need a proper Unitron lens and a telescope tube to make use of it.
Sold "as-is" and as shown - no returns. If you are sure what this is, ask me before purchasing please!
Filed under: Eyepieces & Accessories