This one looks like a worn red Bennington...is there any glaze left on it? Their 'eyes' are where the marbles touched each other while firing. Alternatively it could just be a crockery marble. But the red really makes me think Bennington.
The all blue marble on left is probably a game marble, although Vitro Agate (one of my favorite marble companies because it was out of nearby Parkersburg, WV) did make some solid color opaques. Do the two in the middle have any pontil marks (particularly #3)? I've been at a work training all day so my eyes are starting to cross lol, but I'll post more tomorrow!