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The answer found!
In looking at the machined metal hubs on these 7 or 8" reels it seemed to me they must have been made to provide a very precision mounting of the reel to turntable regardless of angle, shock, etc. I seemed to remember at one time airlines used 2" helical video tape for inflight movies. A bit of searching along those lines revealed the answer. These are for the Sony PV-100 or PV-120.
I was mistaken about the type of tape. It is actually Scotch 360.
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