Larry, Shipnerd, thanks for the quick replies.
Shipnerd, I had been looking at mantle and desk clock movements for a match. It never occurred to me to look at wall clocks - that's a good tip that I'll follow up on.
Larry, given the date on the patent drawing - Dec 15, 1931 - I think your comments on the depression sinking this enterprise are right on. My guess is "Yorke Specialty Company" was planning to offer fancy cases to existing clock companies. This is similar to what they had been doing for high end watch manufacturers under the name "Dinstman".
If you come across any other clues about Yorke, please let me know.