Four years later, I sure wish I could remember why I included "Climax" and some of those others in the list of names for Masters! Where did I get that from? I wouldn't have pulled it out of thin air. Was it in a marble book? Or in an ad?
Edit: Yes, it's in an ad in a marble book -- American Machine-Made Marbles, p. 113.
But it's confusing. It says Master Marbles, but right under that it says Akro Agates. The ad goes something like this:
MASTER MARBLES
AKRO AGATES
in Packages and in Bulk
---- BRAND NAMES ----
CLEARIES ----- GLASSIES
OPAL ----- GAME
CLIMAX ----- UNIQUE
ROYAL ----- HERO
Soooo, I am guessing that's from 1951 or later. Just guessing though. 1951 is when AMMM says that Master acquired old Akro stock along with the right to use the Akro logo and trademark.
An ad which is definitely from later than 1951 still has the Akro Agate name included. I don't see a date but I know it's later because it says Cat's Eye. It goes about like this:
MASTER MARBLE
AKRO AGATES
in Packages and in Bulk
---- BRAND NAMES ----
CLEARIES * GLASSIES
OPAL * GAME
CAT'S EYE
Actually, I think that ad would be from 1963 or later, because in the contact information it has a five digit zip code.