If indeed it is the long / thin Honda Motorcycle Co, then mine is on the frame, between the exhausts. But then my bike is an American model, with VIN plate riveted up on the headstock.
IF E11 label is approx 1" square (indicating European conformity?) then I have 2 very grainy pics showing this placement... though one pic refers to it as an 'E2', and the second pic ... well, it could be an awful big paint flake!
Sorry to be of little use...
Simon