Congratz on having a great and rare car!
But its still not an E550. People install badges that don't belong on their car....happens all the time. Kinda like how some people put S600 and v12 badges on their S320 to make it seem like they have more than they really do.

Your car most likely isn't a Hammer either. The Hammer is a different car with a different motor. I'm not too knowledgeable on the hammer though, but I'm sure someone else can chime in on this.