I am subject to correction . In those days the ignition coils did not have oil in them. The coil inside were filled with a black stuff like bitumen. Even lighting ballast were filled with that stuff. (very Heavy). If the ignition coil in question has that bitumen stuff there is a fellow in Punta Gorda Florida who just repaired mine for a 1928 Dodge Senior. Return time is 2 weeks. Check him out. Cost you nothing.
George Skip Haney,
29436 Tara lane Drive,
Punta Gourda
Florida33982
941 637 6698, 941 505 9085