Thanks Simon
He Isn't sure what model it is, I saw the ad with a view of possibly being a 750 for Bitsa's rebuild.
he bought it back in the 70's for a special and never used it, it's a complete wheel shaft,backplate, adjusters ,
and he says very good rim the term "usable" was mine. I sent photos of my 750 rear wheel and he says it looks very similar, but it has a 17mm shaft so cant be,. He says there are no markings on the rim so i think it may have been rebuilt at some time. I don't need one but is it worth getting to help out someone out or does someone on this site need it .
Rich