That's a nice honest set. These badges are attributed to Friedrich Linden of Ludenscheid. There have been several examples posted here, do a search for 'Linden' or 'FLL' and you will find them to compare to.
Looking for LDO marked EK2s and items relating to U-406.....
I like the set very much!
Nice original later war zinc example made by FLL, they are mostly can be seen in worn condition, this one is still with lots of finish, congrats!