Voice-O-Graph Labelography (Part 6)

This is my sixth update to my Voice-O-Graph Labelography project. I have one more variants for the list today. I correctly integrated it into the assumed chronology.  It's a variant of the 1948 Blue-on-Blue essentially inverting the color scheme to Teal on unbleached paper. The unbleached paper may or may not be a deliberate variation, much like the other with unbleached paper.

This disc is undated but I presume it's approximately around the similar model. I also hav emore information on the Black-on-Green disc. I found one with a metal core. the problem with this is two fold. First it's undated, second I had assumed that the metal core was an early design. So either this is not the case, or the Black-on-Green goes back further than I had estimated. I have not accounted for this incongruity yet. Perhaps with more confirmed dates this will explain itself. [Contributions are 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?