Original U.S. WWII Rare Hawley Paper Co M1 Helmet Liner With Wartime Updated Suspension Technical Handbooks & Manuals The keystone was prescribed as

The keystone was prescribed as the designated symbol of the National Guard of Pennsylvania on 27 August 1879

like the M-36

The spots for the spare bulbs are unfortunately empty

- Size Large- fits 24 to 28 Inch head circumferences

Original U.S. WWII Rare Hawley Paper Co M1 Helmet Liner With Wartime Updated Suspension Technical Handbooks & Manuals The keystone was prescribed asOriginal Item: Only One Available. This is a great example of a rare Hawley pressed paper M1 Helmet liner, without chinstrap. They were only issued in very small numbers during the early days of World War Two. Their structural deficiencies were quickly noted, and the replacement "low pressure" and later "high pressure" liners were put into planning and production shortly after. The Hawley liners were however all that was available during the earliest