M3 Fighting Knife With No Grooves in the Handle

Hello,
I recently acquired an M3 fighting knife, blade-marked “US M3 UC 1943”, but the strange thing is that the leather washer handle has no grooves at all. The end of the pommel is stamped with the flaming bomb, and has two pins securing it to the tang. It does not look like it has been messed with, but is definitely vintage. I can’t find any pictures of a similar “no grooved handle” M3 on the net. Has anyone seen such an M3 knife before? Is my knife legit?

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