Double T,
I had to get out a magnifier to see it, but my 1918 DWM military (h-block serial No.) also has the circle-N on the front sight base, partially struck. Without your picture, I wouldn't have been sure what it was. Now I'll raise you one -- my 1918 has a circle-N stamp on the stop lug, the D-shaped lug on the bottom of the receiver just behind the barrel joint flange (must remove cannon to see it). I dimly remember someone asking about the lug stamp in a previous post. There's gotta be an answer!
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