Rose Gold Elgin De Luxe

Just received this rose gold Elgin De Luxe.  It has a 10K rose gold filled case from Keystone and a 17 jewel movement.  Not sure of the date, but probably the late 30s, early 40s?  It is model 5510e according to the 42 catalog.

The dial has some patina, but it seems to have cleaned up fairly nice.  It also came with an Elgin De Luxe case, but I’m not sure if it is specific to this watch.