Decca (US)
Decca 78s were originally given 3-digit numbers, going to 4 digits in 1936 and passing 2000 in late 1938 and 3000 about 1940. The sequence grew quickly and passed 4000 in 1941. As late as 1944, 4-digit numbers were still used, but somewhat later the series was terminated.
The 1941 Decca Popular Record Catalog lists the following designations for its numbering series: Series 3500 and under, "Popular, Dance, Vocal, etc."; Series 5000, "Hill Billy"; Series 10000, "Mexican"; Series 12000, "Irish"; Series 14000, "Scotch"; Series 15000, "12-inch Popular"; Series 18000, "International Repertoire" – Album Sets; Series 20000, "Classical"; Series 23000, "Personality"; Series 25000, "Classical" (12-inch), and Series 29000, "Personality" (12-inch). There was also an 8000 Series, "Sepia", which is not listed in this catalog.
By the start of the 1950s, numbers were still in the 20000s, with 45s given corresponding numbers with the prefix 9-. The series reached 24700 around the beginning of 1950. Just before 1960 the numbers reached 30000; Decca's issues in the 1960s apparently came much more slowly, as by 1970 the numbers had only gone to about 32600.
Another series of Decca singles wes numbered in the 40000s, apparently mostly devoted to country records.
The subsidiary label Coral used numbers in the 60000s, and Brunswick Records used the 50000s.
Read more about this topic: Catalog Numbering Systems For Single Records