Thanks everyone for the info.
I misread the chart on this Serial # site (   (You need to Login). Thank you for correcting me. As you pointed out, I have an 1898 Model Manufactured in 1899.
I dismantled the rifle today and completely agree. This is almost assuredly an arsenal rebuild. The stock is too perfect, and (as was pointed out) the hand-guard doesn't match the stock, most of the screws haven't been bunged up, and it was still covered in cosmoline. The barrel only has some very minor pits along the stock line and is in very good condition.
I have restored 2 Martini Henrys, a 1906 M96 Mannlicher Dutch Rifle, a Yugo 24/47, and a 303 SMLE and of all of them, this rifle is in the nicest condition. A little cleaning and oiling and it will be ready to shoot. Now to make the cartridges.
Thank you again for your input.