This is a Flexo Band Cool Cap. The Flexo Band Cool Cap was patented by Albert A. Strauss around 1933. The cap is made of reinforced leather with a dome comprised of upstanding ribs allowing for protection and ventilation. The Flexo Band Cool Cap was often colloquially referred to as a "turtle shell" helmet, due to its distinctive style. The Flexo Band Cool Cap was distributed by a few different companies during the 20th century, including the MSA Company and the Portable Lamp and Equipment Company. The leather and metal lamp bracket is attached to the front of the cap. The bracket could have held an oil-wick lamp or a carbide lamp.
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