The Singer Twelve name was used for several automobiles produced by Singer Motors. The "Twelve" in the name referred to the taxation horsepower rating in the United Kingdom.
Singer Motors Limited was a British motor vehicle manufacturing business, originally a bicycle manufacturer founded as Singer & Co by George Singer, in 1874 in Coventry, England. Singer & Co's bicycle
Singer Twelve
…The Singer Twelve name was used for several automobiles produced by Singer Motors. The "Twelve" in the name referred to the taxation horsepower rating in the United Kingdom. The Twelve-Six was powered by a 1476 cc six-cylinder…
Preferred Share of the Singer and Company Ltd, issued 19. October 1903