Some of those corks with the white base look definitely translucent. Some with the more solid-looking white base might possibly show themselves to be translucent if you hold them to a light.
If you can see orange glow in the base of the white-ish ones, then those are Akro Aces. If you can't see fire and it's basically a solid white base, then those are called Akro Prize Names.
(Some of the marbles we will call Prize Names were probably actually sold as Akro Aces but if you can't see the orange then safest not to hope or claim they'e Aces.)
The Prize Name was introduced in 1930 (or possibly late 1929, but I think 1930). That was the beginning of Akro's cork line.