Hi Vic,
I agree that the engraving looks period, and I have owned several examples of indisputable engraved EK1's. Grammar mistakes are not unheard of, but unlikely and immediately raise a red flag for me. I was recently offered an engraved 'Abschiedsgeschenk', or end of service gift, ostensibly from the officer corps of a famous Prussian regiment. It all looked kosher until I noticed that 'Offizierskorps' was spelled 'Offizierkorps', which is wrong. I immediately took a pass on the item. Of course individual collectors have to feel comfortable with items which don't necessarily conform to all regulations. I have a bar which makes no sense, to a Prussian officer. Everyone who's seen it, thinks it's a fake, but I think it's period for several reasons. Having the piece in hand does make a big difference.