It couldn't be a 1917 build based on the serial number, a physical impossibility. Believe whatever you want your entitled to. Winchester produced 225,008 p14 rifles with production ceasing April 1917 upon Americas entrance into WWI. How is it even possible that they only achieved the 93,000 serial number range between April '16 and January '17 and managed to produce another 128,000 rifles between January and April?

You know what You are more correct than I, how dare anyone question your expertise on this subject. After all you read A book. The fact is you have an incredible, immaculate, untouched, virgin of a 106 year old rifle that was never fired and lived in a vacuum until you bought it. How lucky you are, shrewd buy. In fact if I were you I would re-vacuum seal that incredibly rare exceptional example of a rifle the Britishicon didn't want and never fielded in combat and plan on retiring with the funds it will bring if you ever decide to sell it. Good luck, good bye.