California required motorists to register their cars in 1905, but did not issue license plates until 1914. The span of 9 years when numbers were assigned and plates not issued was a period in which motorists used a variety of styles to display their number, with some manufactured plates being available to be made up on request, or just homemade on leather, wood, or other materials.. The Automobile Club of Southern California did proved a porcelain plate made up with the motorists assigned number for a fee.