This is a VINTAGE SUPER RARE August Geiger "Kiel" cap made in Germany in the 1960.  The cap is unique in that it has Russian Cyrillic lettering on it that translates the "Krunstadt," which is a town in East Germany.  I'm not sure what this navy-type cap represented nor who would wear it, but I have never seen one like it before.  It is a European size 57, which is a US size 7 1/8.  The inside lining is in AMAZING CONDITION, and the Aug. Geiger label is perfect.  This is an amazing piece of military memorabilia.