Question: What style of helmet pre-dated the distinctive design used by the German army, a pin of which was given to First World War veterans by the Nazi Party? 

<P0-S0>  To avoid detection he moved the diamonds through various European cities, shipped them to South America and they eventually found their way to New York City. <P0-S1>  Prior to this he had served in the German army during World War I. <P0-S2>  In the United States Werner became Vice President of Davis' company Davis & Co., which shipped large quantities of oil to Germany and became a propaganda strategist and financial aid of the America First Committee, which encouraged American isolationism. <P0-S3>  He was also an agent of the German intelligence agency, Abwehr and was involved in espionage during World War II. <P0-S4>  His father-in-law was a Vice President of Citibank. <P0-S5>  Along with his twin brother, Karl he had become friends with U.S. oil man, William Rhodes Davis. <P0-S6>  In 1922 he immigrated to the United States. <P0-S7>  The operation was stumbled upon by mistake by agents of the Treasury Department when they searched a Budweiser beer box being carried by two American soldiers of German descent. <P0-S8> Werner C. von Clemm (27 September 1897 - 14 April 1989, Biddeford, Maine) was born into a German family that married into German nobility, the Nazi party and prominent American families. <P0-S9>  He was a representative of the German international banking firm Hardy & Co. and an employee of the Pioneer Import Corp., which imported materials from Germany and handled his cousin and Nazi diplomat, Joachim von Ribbentrop's champagne business. <P0-S10>  The United States was neutral and did not declare war until December 1941. <P0-S11>  In 1940 the Nazis seized large quantities of diamonds from Belgium and the Netherlands, which Werner was smuggling to the U.S. <P0-S12>  After further investigation von Clemm was arrested on 28 January 1942 and was sentenced to two years in prison for his crime. <P0-S13>  On his release he entered private banking. <P0-S14>  The letters detailed Werner's diamond smuggling operation. <SEP> <P1-S0> National Socialist paramilitary ranks were pseudo-military titles which were used by the Nazis, represented by the Nazi Party, the National Socialist German Workers' Party ("Nationalsozialistische Deutsche Arbeiterpartei"; NSDAP), between the years of 1920 and 1945. <P1-S1>  Since the Nazi Party was by its very nature a paramilitary organization, by the time of the Second World War, several systems of paramilitary ranks had come into existence for both the Nazi Party itself and the various Nazi paramilitary organizations. <SEP> <P2-S0> Stahlhelm (plural "Stahlhelme") is German for "steel helmet". <P2-S1>  The Imperial German Army began to replace the traditional boiled leather Pickelhaube (spiked combat helmet) with the Stahlhelm during World War I in 1916. <P2-S2>  The term "Stahlhelm" refers both to a generic steel helmet, and more specifically to the distinctive (and iconic) German design. <SEP> <P3-S0> The Steel Helmet Veterans Memorial Badge was a pin issued by the Nazi Party to veterans of the Stahlhelm veteran association of the First World War.