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There were at least three other 1" standards. Philips designed two of them in the 1960s. Neither was widely used. The IVC 1" standard was quite common in the 1960s and 1970s. Their machines were numbered in the 700, 800 and 900 series. I think that tapes were fully interchangeable between all machines.They were a competitor to the Ampex 5000 and 7000 series machines. These became known as A format as a back formation, after B and C were introduced.
Incidentally, the basic video track layout and drum diameter is the same on A and C formats. I have attempted to play A format tapes on a C format machine. I had some success but work would be needed to allow for the different audio and control tracks, as well as different deviation.
My best guess is that these "NEC" tapes are actually IVC format. There are still a few working machines around. If the track layout can be revealed using Edivue fluid then the drum diameter can be deduced. If that corresponds to a known format it would be worth trying to locate a machine.
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