Welcome to the forum and thank you for posting. Your medal is an original zinc piece with the finish faded but a good honest example. The maker '93' is for Richard Simm & Sohne, Gablonz.
Looking for LDO marked EK2s and items relating to U-406.....
I agree with Adrian, a nice original medal !
"In all my years as a soldier, I have never seen men fight so hard." - SS Obergruppenfuhrer Wilhelm Bittrich - Arnhem
Thanks for the info guys!