A number of variations in the standard German Police (Deutsche Polizei) eagle decal can be found.  The first pattern decals were printed on black without a silver border.  These were generally used on helmets beginning in the mid-1930's.  The second pattern decal was identical save for the fact that a silver border was placed around the black shield.  These decals, while used by police units, were in fact originally designed for placement on black firemen's helmets.  Due to the popularity of the bordered version of this decal, it became standard with both police and fire units.  In some rare cases, variant pattern decals were also printed.  The pointed bottom decal on the right side of the top row is an example.  This particular decal is believed to have originated in Austria prior to World War II.