Gunny:
I agree with 99% of your conclusions, however a Parker gun with an early 5-digit serial number was WAY too early for those 1905 and 1910 patent dates stamped on the water table; and they are certainly original in my opinion. That said, the barrel lug does not appear to have the correct removable tapered bolt face (the photo angle is not good)that should be on a Parker gun in the 178xxx serial number range? Also, what is that stamp on the edge of the barrel flats just below the patent date stamp?