Remaining work needs done in the area of date confirmation and integration of the anachronistic metal-core green label discs. I also do not discount the possibility of more color variants. [Contributions are always welcome if you know more.]
Red Top on Yellow: Unknown, assumed to be first disc1943?
GEM Mutoscope Disc: 1945?
Red on Yellow: 1943, 1944, 1945, 1946, 1947
Red on Beige: 1946, 1948
Red on Unbleached: Unknown 1940s?
Red On Blue: Years 1947
Teal-on-Unbleached : Year: 1948 (assumed)
Blue on Blue: Year: 1948
Black On Red: 1948
Black on Green: Years:1951,1953 - 1955 (also had metal core variant)
ESO Mutoscope Disc: 1950s?
Mutoscope Black Label: (45 rpm) Years????
Black on White (45 rpm) 1957, 1959
Blue on White: Unknown assumed 1960s?
Black on Yellow: Years 1964
Black on Red: Unknown assumed 1964?
Yellow Label Unknown assumed 1964?