I know nothing !!
But... I remember in the 70's being told that some of the Black Issues were "re-issues" and some were "proper". This may have been assumed as there were always copies about. Anyhow, on that basis, I got a demo (which I think looks better anyway).
I've just checked the JM site and he has one for sale with the comments..
Genuine authentic 1966 stamped matrix, thin vinyl first press - of this Golden Torch Northern Soul anthem - classic early 70s spin - repeat .this copy is the genuine original press!
So, I wouldn't be surprised either way.
KB