Цитата:Green Brain with Metronome subtitle:
- Years: 1972-1974
- Catalog numbers: 1001-1055
Green Brain without Metronome subtitle:
- Years: 1974-1976
- Catalog numbers: 1056-1091, and 60.000-60.019
Multicolor Brain (A.K.A. Yellow -- the one with the orange background color):
- Years: 1976-1980
- Catalog numbers: 60.020-60.353 (or thereabouts)
Black Brain:
- Years: 1980-1990s
- Catalog numbers: the rest of the 60.000 series
