Most of Kroenen's masks used in Hellboy are based on a standard design. The WWII and Ninja Masks are except for the greeblies basically the same. The main body was also used for the "Sandstorm Mask", which can only briefly be seen on the table in the sewer scene. The reference material I had included besides the poor screencaps fortunately a picture of the real prop which can be seen on the upper right corner. A sideshow mask was used to build this version.
