original late 1930's wall-mount american industrial heavy gauge die cut steel factory and/or plant informational sign fabricated by the stonehouse steel sign company, denver, co. the notification sign was used as apart of the "safety first" or "think" campaigns used in factories to create awareness over avoiding injury and death in hazardous environments. the oversized sign remains in good condition, with general surface wear and discoloration - a testament to its age. the factory sign contains multiple mounting holes along the edges. measures approximately 20 x 28 inches.