The blued bolt is an original small lug configuration, congratulations! If the chamber on the right is the 6 digit one it has not been modified and is original to the rifle. The daisy on the extractor is a Weedon stamp but may just be a used replacement as they are easy to break if not feeding from the magazine. If the rifle doesn't have that stamp on the bolt handle and the receiver then it hasn't had a Weedon refurb and was most likely made later with the larger bolt lug. The NS stamp stands for nickel steel and was a common stamp on later Winchester P14's and all US Model 1917's. - Bill