-The MK 2 Scabbard is very "clean," -no cracks, whatsoever!
-The frog has no tears in the cotton; rivets and snaps are snug.
-The knife fits really well in its scabbard.

No maker's mark; it must've originally been guard-marked -maybe Camillus or KA-BAR?

I've been reading up on SeaBees and looking at similar WWII Pacific Theater knives. This one, like many the SeaBees made, has brass (the crossguard), aluminum (pommel and against cross guard), and bakelite (in the handle). These materials were often salvaged from downed or disabled aircraft -nothing was wasted.
The handle has no looseness or play, at all.
Here's an interesting site:
http://plowshareforge.blogspot.com/2007 ... nives.html
What do you think fellas?