I have a savage mdl 99F s/n 950xxx win.308, it has a small oval stamp with the letters (SP) on the top left side of barrel. it also has what looks like the letter J stamped on the left side under the stamp that says SAVAGE model 99 that is on top left side of reciever. it has brass counter on left side and safety on right side of lever. can anyone tell me the date of manufacture.