Original Cold War Danish M48 Clone U.S. M1 Helmet Shell - Repainted OD Green Hand Select:No with an aluminum stiffener inside

with an aluminum stiffener inside that has metal clips on the exposed ends

From what I've been able to glean

which created a major obstacle for crew members moving down the fuselage even on the ground

and their own suppliers

Original Cold War Danish M48 Clone U.S. M1 Helmet Shell - Repainted OD Green Hand Select:No with an aluminum stiffener insideOriginal Item: These helmets were manufactured nearly identically to the specifications of the US WW2 M1 Helmet. The Danish M. 48 (model 1948) was a NATO contract helmet and every shell was manufactured either in Austria by the Ulbrichts firm or in Germany by the Linnemann Schnetzer firm. Steel shell features a classic steel pot shape with rear seam, swivel bails (chinstrap connection points) and a canvas chin strap with steel claw connector. These