Type: Old classic key of the (Skeleton / Barrel Key) type. Estimated age: Dates back to the period between 1880 AD and 1940 AD (its age is about 80 to 130 years). Past use: Opening interior doors, wooden cabinets, drawers, and large wall clocks. Current use: Used as an antique decor piece or for collecting and hobbies. Condition: Made of cast iron and shows antique rust, giving it a heritage look.