They are extremely close in design, has any link been established between the makers?
I think the FLL eagle has sharper details on this example and the head looks very slightly smaller.
Looking for LDO marked EK2s and items relating to U-406.....
No links but maybe a partnership due to the located area Ludenscheid who knows ? FLL Fiedrich Linden Ludenscheid / GWL Gebruder Wegerhoff Ludenscheid