Had a little free time this afternoon and ventured out to GM to investigate this M1917.
What I found was an Eddystone that appeared to be all original: Eddystone receiver, barrel, stock and bolt. Did not get to tear the rifle down to analyze all the parts (most parts were marked on these).
The finish is a fairly dark black, which may be original? The serial number was stampled on the bottom, near the heel of the stock. A small oval brass plate is on the right side of the stock with the # 70. Original? I don't know.
Bore looks good with sharp rifling and gauges a 2 (I carried my CMP gauge out there)
Is it worth $599? Not to me. Although it appears original, some bubba drilled a hole on the face of the receiver somewhere between 1918 and now. It's not a complete hole, but kind of a half-hole on the receiver just above the bolt. Enough to obscure part of the E in Eddyston.