I hope y'all can see this

http://hotfile.com/dl/85328353/6108903/

codec is FFVH (ffdshow's Huff)
It contains the first forty-nine frames from PVI pressing 1425-84
(which might or might not be same as GOUT's first forty-nine)

I suspect it was always a grid pattern (i.e. scanlines in both dimensions)
We just don't have enough horizontal resolution to see the vertical lines in the wide LD caps.

Remember in the best-case scenario (if you had a HLD-X0 that wasn't twenty years old, or maybe aleksbmw's Hercules) you'd only get ~425 lines of horizontal resolution.
What would happen if you shrunk the SE image to ~425 width, then blew it up again. Would the vertical lines still be distinguishable?

GOUT might have shown them . . . if DVNR hadn't smeared them away already.

Perhaps dark_jedi's pan/scan cap should have shown the vertical lines, but maybe his old player was a hunk of junk or otherwise under-performing, and that's why he upgraded to CLD-79 Elite....