Hallo, I found out, that some were made for the Crew. These were made in the USA from the ballast iron of U-Deutschland. But after Amerika was starting war against Germany, these Iron Crosses did not come to Germany. After the war, Kapit?n K?nig brought about 5 of them back to Germany (around 1930). The crew has had 29 members, maybe only 30 of the crosses were made? Does somebody know, is the centre medall at both sides made of real gold?