USA - Army/Infantry - Military helmet - American M1 helmet

American M1 helmet post-World War II, all original. In good condition, it shows no rust. It is complete with liner, camouflage cap, helmet strap, and chin strap. Due to layers of paint, it was not possible to identify the manufacturer of the metal dome; the liner bears a round mark (not identifiable) topped by a 7-. The metal dome has various layers of color; the surface layer is a dark olive green anti-reflective (Army green) typical of continental climates, while the base layer, visible through a scratch on the dome, is a lighter green more associated with tropical climates. The helmet is of the type used by infantry, including in Vietnam. The liner was refurbished in the 1970s. Based on the above, I believe the helmet was produced in the 1950s or 1960s. The helmet comes with its instruction booklet for liner use, in excellent condition and complete with all pages.