M-G-M Records - US

10000 series - February 1947-June (?) 1951 - this is mostly 78's, most "early" 45's were issued much later. The true introduction of 45's is at the end of this series.
11000 series - June (?) 1951-June 1955 - 78 & 45 rpm records
12000 series - June 1955-April (?) 1961 - 78 & 45 records for the first half of the series, then mostly 45s, last 78 was 12738
13000 series - April (?) 1961-October (?) 1968 - 45's only
14000 series - October (?) 1968-1980 - 45's only
50100 series - Stereo 45s - 1958-1959
55000 series - Rhythm and Blues - 1955-1956 - 78's and 45's

Color coding

78 only

78 and 45 with different numbers

78 and 45 both using the same number

45 only

Purple is used to indicate is used to indicate transferred, cancelled and not issued records.

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