On page 14 of his book Col. Brophy says 1,506 L. C. Smith guns were sold to the govenment out of the 22,378 produced from 1940 through 1944. But I don't see where he identified how they were marked. And I would think the army would have wanted 12 gauge guns, not 20 gauge. And as you said, I've never seen the codes on my gun listed among the military markings.