I couldn't find any information about these dice on the web or in the Gaming Table. Any help is appreciated.

- Thunderbird 1944

Well, the Thunderbird in Las Vegas opened in 1948, so it must be another Thunderbird. On the six spot is a serial number (498), very unusual for the 1940's. Size 5/8", concave spots.

- Bison Club

Size 5/8", solid spots, no serial number, light crystalization on the corners.