New to me Rock Island 1903 with strange marking

[bcd8238]

Plus more pictures. There is no NS mark on the bolt. The single gas port is the same size as the one in the extractor. No Hatcher hole. There is a H stamped under the bayo lug. No cartouches I can see on the stock. There is a W3L on the bolt handle stub. Any information is appreciated. I understand that this rifle was made in 1919 as the serial number is 338524. Barrel was replaced in January 1931 at Springfield Armoury. What is the significance of the W mark infront of the mag well?