I believe this is a genuine blade, fakes typically don't have the raised foundry/forge markings, and this particular foundry mark is known to be period. Obviously the Rohm inscription and maker mark are fake and poorly executed, I imagine the SA motto on the reverse is correct and period, however not Eickhorn.

The M/O for some forgers is to take a period blade, grind the reverse clean and re-etch mottos and maker marks which are seldom even close to correct. SS fake blades often started out as SA blades, both sides ground and replaced with new mottos and maker marks. This is partly why you never encounter "correct" crossgrain polishing on the forgeries as it is difficult to replicate accurately.

Red