Ken,
A lot of independent lens makers of this class of optic used a T2 mount. As the lens is a fixed aperture there was no requirement for aperture linkage.
If the lens has a threaded mount then my money is on it being a T2 mount. I have had a look at a Jessops catalogue and they do them for £5.97.
You have not said what camera you wish to attach it too.
Something to be aware of with mirror lenses is that they are fixed aperture. - The exposure can only be controlled in manual mode using the shutter speed.
Don
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