Vintage 1920s "FLEXO BAND COOL CAP" Miners Hard Hat HelmetThis antique miner's helmet is believed to have been used during the 1920s coal mining era. The Turtle Top style safety hard hat was ideal for miners working diligently to extract coal from local US mines. This Hard Boiled Brand Miners Helmet was made by the E. D. Bullard Company of San Francisco, California after 1919. With a leather and metal bracket mounted onto the front of the helmet it was used to hold an Electric Lamp helping them to see in the