That ebay stuff is labelled MK.V, tested in 1973, so it expired by 1978 at the very latest. Even if it should still be usable in some way, it will be way off the original specs (whatever these may be - that was a type of motion picture stock already rare and obsolete when I studied cinematography in the early eighties).
It was superseded by cine HP5 in the late seventies, but that may have been a mere rebranding - that is, it may already have been cine HP5 under another name (possible given the V in its name), or could have been a cine version of HP4 (special versions of which continued on their list almost into the nineties). But it won't be much more different than that, and HP4 and HP5 development times have only insignificant differences. Nominal MK.V figures might be different, but that need not interest you unless you process it for cine use - sensitivity and processing time figures for cine film are always slightly different from those for identical still film, due to the different (lower) target contrast.
It was superseded by cine HP5 in the late seventies, but that may have been a mere rebranding - that is, it may already have been cine HP5 under another name (possible given the V in its name), or could have been a cine version of HP4 (special versions of which continued on their list almost into the nineties). But it won't be much more different than that, and HP4 and HP5 development times have only insignificant differences. Nominal MK.V figures might be different, but that need not interest you unless you process it for cine use - sensitivity and processing time figures for cine film are always slightly different from those for identical still film, due to the different (lower) target contrast.
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