In 1922 the borough obtained an official grant of arms from the College of Arms. The lamb was moved to the crest, on top of the helm. It was transformed into a paschal lamb supporting a pennon of St George. As a number of other crests featured a paschal lamb, a silver and blue wave, for the River Thames, was added. The arms themselves retained references to the Duchy of Cornwall (the black border charged with "bezants" or gold discs) and the Archbishop of Canterbury (the mitre and crozier). The red cross in the first quarter was taken from the arms of the London County Council, showing that the borough was in the county. The fourth quarter contained a gold and blue chequered pattern, the arms of the de Warennes, Earls of Surrey. This was included to show that Lambeth lay in the county of Surrey until 1889. The ermine patterning in the other quarter was said to stand for "purity and honour".