Here's a copy of John Dough and the Cherub from 1930 or so - the rear dust jacket flap lists Oz titles to Yellow Knight, the Oz book published that year. This must have been one of the final printings of this title by the Reilly & Lee company.
When Reilly & Britton changed to Reilly & Lee in 1919, several of the L. Frank Baum books underwent changes in appearance. In particular, early titles that originally had stamped covers were changed to paper labels. The Patchwork Girl was one exception - although it too was changed in the 1930's. In some cases, this required a bit of re-thinking on the publisher's part.
For John Dough, the original cover design (shown above right) was used, but it was changed to a full color paper label pasted to the front of the book, instead of a 3 color stamping. The design from the spine of the book was used on the spine of the jacket but only printed in black; this raises the problem of John's disappearing bow tie! I would have thought, considering that the cover was now full color, the spine could have been colored as well!
This past Christmas I did get around to making some John Dough gingerbread cookies. Unfortunately, I couldn't lay my hands on any Elixir of Life, the special ingredient...