According to that serial #, it was made in 1905, but the .300 Savage didn't come out until 1920, so check your number again. Go to this websight and plug your # in. http://www.savage99.com/savage99_dates.htm
Those Stith mounts are rare and very cool!! A mount in good shape is worth upwards of $350!! I have a 1930 vintage takedown in .30-30 with a Stith mount with a Weaver 2.5. The rifle shoots amazing.

The serial # is on the bottom of the receiver in front of the trigger guard.

And it doesn't exist without pictures!! We all enjoy a little gun porn!!