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Grahame it’s nigh impossible to say without any identifying labelling or engraving. It looks like a Cooke, but theirs always had the name clearly engraved on the backplate supporting the eyepiece drawtube.
Another possibility is the objective lens, sometimes the makers name is pencilled or engraved on the side of one of the glass elements. The objective elements should also have alignment marks so that the elements can be reassembled correctly.
Any clues as to where it has been, the previous owner ?
Have you tried it optically ?
Last edited by Wavytone; 08-03-2018 at 05:35 PM.
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