It’s fun to learn about these old knives. Especially the military pocket knives. They get over looked, the combat knives get all the glory.
I agree yours probably lost it’s bail along the way. Most if not all 4 blade camp/scout style knives have bails.
I always wondered why the USN marked their 4 blade knives with the MD it’s the same knife the other branches gave everyone. Then had a USN marked 3 blade knife for the sailors when nobody else even issued a 3 blade knife. It’s strange.
All the bone handled ones I have have brass liners and two piece can openers. (Except for the Mountain division model with a hook can opener, but it’s different than the ones after the war)I think they are early or Pre ww2.
I don’t have any with blade etches or a can opener like yours. It’s a great knife to have.
After ww2 they all had the one piece hook can opener. ((AFAIK)