Hmmmmmmm........
I've never noticed anything like that on my minty 1953 Model 99 "EG". Savage used an oil finish on their wood, so whatever else is on the wood besides a common oil finish was put there by someone other than the factory.
If it bothers you, I'd take it off. But if it isn't all that bad, then leave it alone and save yourself a refinishing job on the wood.
The current "going price" for a Model 99C in .308 caliber in "nice" condition is anywhere from $450-$600... depending almost entirely on "condition", "condition", "condition"!
Enjoy your "new" (old) rifle in good health... it's one of the finest examples of an eastern deer rifle there is... and the .308 caliber is perfect for deer. It isn't "valued" very much by collectors, but it's just fine as a "hunter"... and you got it at a VERY good price!
Strength & Honor...
Ron T.