GT-Notions was founded by David Stravitz, who created various series of porcelain buildings and accessories, some of which are modelled to 0 scale. The range includes Roadside USA, and pieces created with The Lefton Company. Lefton, known for fine porcelain, was formed by George Zoltan Lefton who emigrated from Hungary to the USA, arriving in Chicago in 1939. The Lefton Company was founded in 1941.
An interesting article regarding David Stravitz may be found at the Pittsburgh Post-Gazette web site.
GT-Notions Lefton billboard, 6 x 4 inches, ideal for a layout