Phonozoic, but the core is aluminum. It's uncertain, but my opinion is that all or at least more of the color variants of this type of Recordisc label were concurrent. I think that the aluminum discs predate the fiber-core blanks generally. The dates are generally from 1946 - 1949. I have one that dates to 1942 and I admit that seems spurious and it may be a second generation dub.This one is different from the others in that it does have a date "2-3-48," but no other information besides a wavy line that might be a signature...can't tell. The B side also is dated "2-3-48," but it it's blank or worn smooth, either way there's no audio to be had.
There are three voices on the recording, two male one female. It took me a little time but I quickly realized that they were doing a reading of Alice In Wonderland. It is from CHAPTER VII, A Mad Tea Party, you can read along here. I've clipped and posted the most clear portion above. I reduced the bed noise as much as I can with a noise filter, but it's clear this disc had a lot of plays which wore down the groove notably. It begins on that page with the words "I do,' Alice hastily replied; `at least--at least I mean what I say--that's the same thing, you know.'" It's worth reading along for a bit. I can't tell if this was a copy of a commercial version or some amateur production... but both seem plausible.