Ed, I have quite a few "trench knives" I have watched them and collected them for several years and have never seen one that was unit marked.
My thoughts are that yours is a WWI piece and seems to have been fashioned from an earlier weapon. I might also be inclined to think that the unit mark applied to the earlier incarnation of this blade.
The reason I think that is that I do not know that trench knives were ever issued by the army to troops. I think that they may have all been private purchase or "gifted" by unit commanders, etc.
Please remember that I am at least 50% F-O-S, but my regards to you and your family anyway.
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