this is the test footage from the original Jack the Giant Killer (1962). they changed the sea monster, obviously, and Galligantua somewhat. I think this is from the Japanese disc of the movie. notice all the blood in this footage.
as we all know, I love the tentactled monster from the movie a lot. this critter is certainly unique, and I am sure that I would have liked it quite a bit had it been in the movie, I'm glad it's the way it is.