cavx, the 1953 version has never made it to BluRay. It needs a LOT of restoration and there just isn't the interest in the general public to pay the cost of restoration. I myself purchased the downloadable clip off of iTunes. The copy it was taken from is a little beat up and aged, but it looks better than the DVD did.
I did see, last week, where someone posted on Youtube some unused footage and miniature shots from both WOW and When Worlds Collide.
Here's the WOW link:
https://www.youtube.com/watch?v=v0kQpihBy7I&t=19s