Mike Ballew
Second Unit
It wasn't a flicker, the picture pulsed. See my post just above.
I can corroborate what Johnny Angell says, and a YouTube search will confirm it beyond all doubt. The effect in the original broadcast was much, much more impressive than what we find in these 35-year-old recordings on YouTube. But I should underline, VISIDEP was no substitute for the honest-to-goodness stereoscopic 3-D video we enjoy today.
VISIDEP might be considered a cousin of sorts to field sequential or frame sequential 3-D, but it definitely "wobbled" or "pulsed" and did not flicker. The field sequential systems I've owned presented two images that appeared to be superimposed. It sometimes appeared to the naked eye that the two images were present simultaneously, though of course this was an illusion. VISIDEP allowed its two images to rock back and forth, back and forth, not unlike the still GIFs Bob sometimes presents to show off a given moment in a new 3-D restoration.