Label Codes

The Labelcode (LC) is a four-or five-digit code prefixed with LC. It was
introduced to uniquely identify different record labels. Codes are
currently assigned by GVL to companies engaged in music recording that
are located in the countries of the EU.

gvl.de

Guideline on Catalog Number at
discogs.com

Labelcodes forum discussion at
discogs.com

Labelcode article at
wikipedia.org
(article in
German)

List of Labelcodes at
wikipedia.org

(article in German)