I just saw, that there are many fake Fliegers on the ebay. Both "complete" watches, both kits (dial+case+hands+rotor) missing only a movement, to create a fake watch. As I saw, they are usually sold from the UK, from various accounts.
If you search for "Fortis case" you will find them.
The most obvious tells:
-blue dial (never existed)
-strange white dial (the original looks different)
-low quality caseback (not even writing on the edge, "faded" logo in the center)
kit on ebay:
fake blue dial:
fake white dial:
genuine white dial: