„Gules a key upright Or between two escutcheons; dexter, Or charged with a lion counterrampant sable armed and langued gules and sinister, Argent charged with a double-tailed lion rampant Gules armed, langued and crowned Azure.“ The arms were granted on May 22, 1939. They show the symbols of the the patron saint of Electorate of Cologne (key) and symbols of Duchy of Jülich (lion sable) andDuchy of Berg (lion gules).
Stadler, Klemens; Deutsche Wappen - Bundesrepublik Deutschland. Angelsachsen Verlag, 1964, Band 1, S. 52 
22 May 1939

file made by Jürgen Krause
colors according to FIAV
Wolfgang Pagenstecher