Wow, lucky you! Movements are much easier to find than the cases for these. Of course that's the way it is for most, especially gold, cases. I have the opposite issue. You may have seen my post on the AT&Co. 10s? It's still on my bench awaiting the re-installment of the balance assembly.
Good luck finding a nice movement. They ARE relatively abundant. Not in the nickel plated finish, but gilt are available. I believe that the winding arbor is located in the same spot on the three (?) variants, but I am not certain. Ehrhardt & Meggers's "American Pocket Watches, Identification and Price Guide" shows all types and the arbor looks the same. Cheers.