Nice, looks like a wartime stock, what year is it? Funny they charge $10 extra for Tula, but still a great price.
check to see if the rest of the parts also have the crylic letters stamped on them. That will tell you if the parts are truly matching.
Unless it's a Finn rework, the bolt knob is not supposed to be serial numbered.
Are there any signs of if there was a Finn rework that I should look for? I have been looking through the http://7.62x54r.net/ site for info but have not found much except the Tula info which this rifle is consistent with.
The main giveaway would be the boxed SA stamp on the receiver. Although by looking at the picture I can pretty much tell you now that it isn't a Finn rework. Unless, it was captured by Finland then recaptured and refurbished by the Soviet Union again.