According to For Fuhrer and Fatherland Navy Awards above Grade 4 had a metal shield with an anchor surrounded by oak leaves.They also had acorns ( different colors) winged shells , shells , and torpedos.The colors for the items were ;
1st Award - Black
2nd Award - Silver
3rd Award - Gilt
This is a great post and hopeful people will post items.Glad to see it has been revived

You know you're over the hill when "Happy Hour" means Nap Time