I am not certain, but I think that the chamber date was determined by contract date between the navy and DWM. The delivery date had no relevance. I think that the 1918 delivered navies satisfied a 1916 contract, so these numbers were included in the 1916 count and were chamber dated 1916. There are no official chamber dated 1918's. Anyway, thats is my understanding and I have been wrong before (I think it was early 1958) and I may be wrong again ... someday.
Big Norm
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