I think that red marble could be a special one, I would need closer view to tell but it may be an original silver oxblood made by Akro in the 40's.
They made them later but the best version has white and silver ribbons with red/black rather than solid silver with red/black. The value of these ones depend on the design of the marble because each one was slightly random.
You will know if it is an original oxblood because it will have four-five colors, a base color with ribbons of another color and between that will be ribbons of dark red with a black filament in the middle of the red. The base color is almost always translucent. They will always measure 5/8".
I found a limeade oxblood once and sold it for $250, I could have held out for $400 to the right buyer though because the design on it was amazing.
This one is very similar to the one I found.
gm1126 MINT(+) 5/8" Akro Agate Limeade Oxblood
"Ade" corkscrews are identified by their base glass of translucent off-white mixed with wispy opaque white. The spirals on these marbles will be translucent and come in yellow ("lemonades"), green ("limeades"), orange ("orangeades"), red ("cherryades"), and reddish brown (Carnelians). Sometimes these spirals will be accompanied by oxblood, though this is a more common feature on Ade swirls (see below). Lemonade oxbloods and limeade oxbloods are most common; typically, there is more oxblood on the former than the latter.
A nice example of a silver oxblood corkscrew "ade" can fetch $100.
A normal silver oxblood without the "ade" can be $10-$20.
