Take a look at the side Bb/C/altissimo E&F keys. Major difference. They're also bigger pictures. Nyah!
That Imperial is interesting for lots of reasons, but I'm gonna go with the, "Best of the World," engraving and no Keilwerth stamp near the thumbrest. It'd be interesting to see if there are any other "Imperial" models under the New King or Toneking categories, as this one is obviously in the "King" category. Helen, just out of curiosity, did JK discontinue the King model line before, during, or after WWII?