7404-271 STANLO steel building kit. In 1933, in the depths of the Great Depression when nobody was building, Stanley was desperate for new products, and hit on the idea of producing its own line of toys similar to the Erector Sets that had been introduced in 1913. Thus was born the Stanlo Master Building Set which, according to Stanley propaganda, was an instant hit and saved hundreds of New Britain jobs. Unlike Erector Sets, the Stanlo system didn't require nuts and bolts, but consisted of a series of metal plates in various sizes, shapes and colors with loops along the edges that could be joined together by inserting steel rods (like hinges). There were six increasingly elaborate Stanlo sets, from No. 1 through No. 6. This one has a 19-1/2" x 10-1/4" blue pressed steel box with blue paint, traces of original label so not sure what model it is. Has fully intact instruction set and seems to have most of its parts including electric motor, clean. Good+ (NPO836) 50-100