Hello Jim
The book skips over your serial number but some of the information you have given helps. It was made in 1909 or 1910 and is a grade 2 or G grade as indicated by the "Parker Special Steel" on the top rib. The 5/8" barrel diameter - if taken as the outside diameter - is correct for a 28 gauge and not a 20. If taken as an inside diameter it is closer to a 20 gauge. If it is a 28 gauge GH or GHE it could be worth as much as $20,000 depending on condition. Taake as many pictures as you can of the barrel flats where all the stampings are as well as the "water table" of the frame where the serial number is. Does it have a pistol grip or a straight grip? Take high-resolution (sharp, not blurred) pictures of all aspects of the gun. We would love to see your gun and drool on our keyboards....
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