The International Mutoscope Corporation used different labeled blanks essentially everywhere, for the entire duration of their existence. The problem is that they existed concurrently, not purely consecutively. Their switch to 45 rpm is the only strong demarcation in manufacture. Some label types and colors are more rare than others. I've only ever seen one picture blue one, ever. The Black Mutoscope seems to be a UK import. The blue label image came from the Blog "Under Design." The red one from the Dull Tool Dim Bulb Blog. I have never seen either personally and assume that they are both very rare. I am also aware of a red half-circle design, but presently lack a high res image.
Black on Green: Years:1951, 1955
Blue on Blue: Year: 1948
Red on Yellow: Years: 1943, 1944, 1945, 1946, 1947
Black On Red: 1948
Red on Beige: 1946, 1948
Mutoscope Black Label: (45 rpm) Years????
Black on White (45 rpm) 1957, 1959
GEM Mutoscope Disc:Years: 1945?
Empire State Observations Mutoscope Disc: Partial post mark to 1953? Last digit unclear. Patent Number 2600573 dates to 1946.