USM1 helmet consisting of a shell with a closed front bead. There are several cracks on the sides of the shell. The chin straps are missing. The exterior shows noticeable oxidation. The batch number is not legible. The liner is made of high pressure composite material by Firestone. Some cracks are visible on the edges. The leather cap and chinstrap are missing. The khaki coloured exterior paint is approximately thirty percent preserved. There is marked wear and a characteristic patina. Condition II+. USM1 helmet consisting of a shell with a frontseam rim. Several cracks are visible on the sides of the shell. The bails are fixed, and the chinstraps are missing. The exterior shows significant oxidation. The lot number is not legible. The liner is made of highpressure composite material by the Firestone company. Some cracks are visible along the edges. The suspension and the leather chinstrap are missing. Approximately thirty percent of the original khakicolored exterior paint is preserved. Notable wear and a characteristic patina are present on the piece. Condition II+.