Well, according to the LBC and the 1181xxx serial number, you have a model 99C made in 1968.
According to the A0572xx, it would date to early 1969.
The 1181xxx serial number is very near the end of 1968, so it looks like your rifle somehow either went back for work or got laid aside and finished a couple months later? Not sure we've ever seen one that had two different serial numbers stamped on the outside. Gotta drive the FFL's nuts when they go to log it.
“The Savage 99 Pocket Reference”. All models and variations of 1895’s, 1899’s and 99’s covered. Also dates, checkering, engraving.. Find at www.savagelevers.com
