c. 1918; postmarked 1920; "The Detroit Stove Works, the World's largest stove plant, was the first stove plant to be established in Detroit. The company was organized in 1864. The factory covers over 13 acres of ground and employs over 2000 skilled workmen. The product is manufactured under the trade mark name of "Detroit Jewel" Gas Ranges "Jewel" Stoves, Ranges and Furnaces. Over four million "Jewels" have been made and sold. A western office and warehouse is maintained at Chicago, Ill."; the factory was located at 1320-1380 Jefferson Avenue East.