I think this fellow sold one of these last week. Here's another:
http://www.ebay.com/itm/ORIGINAL-Iron-Cross-1st-Class-Screwback-Variation-German-WW1-WW2-/250927558524?pt=LH_DefaultDomain_0&hash=item3a6c72af7c" onclick="window.open(this.href);return false;