Thank you Bruce,
This is a hard leather case with a Trademark date of 1916. Leg of Mutton sounds correct. I'll get out the camera and take some pictures of the case. I had forgotten about this case. It still has it's wooden 3 piece cleaning rods with a rag attached. That must be 75 years old.
The side identifier tag came off some time ago. Besides the 1916 date; all I have is the 28 4 stamping.