Massive tape, possibly data?

Hello again!
I'm not sure if this belongs in General or Repair and Restoration, so feel free to move this thread Tezza!
A few months ago, I got this massive magnetic tape reel from a local art studio when they were clearing out their storage room and I've never really known what it was.
It might be a video tape of some sort, or a data tape. I've got no clue, as this is WAY before my time, and still a wee while before my vintage computers were made too.
Here is a link to some photos. The only markings on the tape is the brand, Scotch, and in vivid, 7 Phil. http://imgur.com/a/CLYJn
The tape is in very good condition under the top layer.
Any idea what it might be?
I'm not sure if this belongs in General or Repair and Restoration, so feel free to move this thread Tezza!
A few months ago, I got this massive magnetic tape reel from a local art studio when they were clearing out their storage room and I've never really known what it was.
It might be a video tape of some sort, or a data tape. I've got no clue, as this is WAY before my time, and still a wee while before my vintage computers were made too.
Here is a link to some photos. The only markings on the tape is the brand, Scotch, and in vivid, 7 Phil. http://imgur.com/a/CLYJn
The tape is in very good condition under the top layer.
Any idea what it might be?