This is an original M-40 single decal German army helmet. Nice green/gray original paint on shell. Inside shell is marked under the back skirt "DN57" (Manufactured in Germany), and "NS64" (indicating production by Vereinigte Deutsche Nickelwerke, size 64). Liner is in good shape, marked 56. The liner still has a couple vent holes not pushed through, as shown in the book "German Helmets Of The Second World War,Book Two, Page 155, by Branislav Radovic. The chin strap is marked "St. Orthey, Larieberg/Ww, 1941" indicating a reproduction, No charge. The overall color and style of this helmet is nice and the single decal adds to the desirability and value. Nice helmet for any collection or display.