I am looking for a black and white science fiction movie that I watched a couple of times on a Saturday or Sunday afternoon in the early to mid 1960's on local Los Angeles television. The movie was probably made in the 1950's but it is possible it was made in the very early 60's.
The movie involved time travel or time distortion and it kept repeating the story in a loop going faster as some kind of time paradox was created. I think it was set in the future, but I am not sure. It ended by time just looping out of control.
I thought it was black and white, but now I realize that I really have no idea. I watched it before we got a color TV so it could have been either. Also, I now think that it was probably 1966 or 1967 that I watched the movie on TV. Does anyone have any idea what this movie was?