The Dormeyer Mix Maid came before and was horizontal. Oddly the "Princess" came after and reverted back to the old vertical style. It is about 100 watts, not a killer kookie mixer.
That looks like the hand mixer I have from my mother that she won back in the late 1950's. I found another Dormeyer stand mixer in an antique shop last weekend and almost brought it home. I guess I must have broken my hoarding ways!
What type of speed control did these models have? Tapped field, adjustable brushes, or governor controlled? Was this the last vertical mounted motor mixer model to be manufactured by Dormeyer?