USM1 helmet. USM1 helmet shell. Front snap fastener. Batch number 1029. Mobile bridges. Rear chinstraps. Inside of shell with A marking in yellow paint. Later exterior paintwork. High pressure composite liner. Westinghouse manufacture. Liner completely deformed and re-glued in places. Significant swelling to front of liner. Full canvas cap. Rear drawcord. Sweatband complete. No visible markings on the nape of the neck. Leather chinstrap missing. Khaki paint 40% later. Captain's ranks in white paint also later. Some wear and patina. Condition II+. USM1 helmet. USM1 helmet shell with front seam rim, lot number 1029, swivel bales, later chinstraps. Interior of shell marked with yellow painted letter A. Later exterior repaint. High-pressure composite liner by Westinghouse, heavily deformed and reglued in places, with major swelling at the front. Complete web suspension with later drawstring. Complete sweatband. Nape strap without visible markings. Leather chinstrap absent. Later khaki repaint at 40 percent with later white painted captain rank. General wear and patina. Condition II+