She arrived today even better than expected, really: Thanks to Tire-comedon for that last catalogue page.
You may all know this, but Birks is the Canadian equivalent of Tiffanys in terms of high end jewelery stores. They sold several brands with their imprint; I have seen older Breitling, Rolex and Eterna models. It continues to carry Rolex, but less of the major brands, more of the fashion watches and relabeled Birks watches. I believe they just lost being an Omega AD. Beauty of a watch! Strap fits it well IMHO. Congrats!
Found another 1940 catalog (showing same case but with the 23.4SC) in my drawers...: Hope you'll enjoy it!
Yann, You are amazing with your graphics. You are hereby nominated to be curator of the vintage Omega arts ! God, I wish you were English.