I don’t know about early VHS cassettes, but judging from the packaging of most of the SKC cassettes I’ve dealt with, it seems that durability was a major concern. The SKC HQ Maxplay Grade cassettes have been a very sturdy and reliable performer – the package is quite memorable.
It seems that the cassette reels have had minor changes – two variants have been noted in our collection, but the bottom plate is the same on both. The second variant has a clearing in the clear top hub plate where the reel clip is. In both cases, the clear plate is frosted. The cassette has a fairly robust hatching pattern, which is very grippy and distinct.
Finally, here is the spine, with an original label affixed (two variants).
There was also a (possibly earlier) variant which had a slightly different front and cassette shell, proclaiming the use of a back coating which improves the tape quality.