It's a 99R with very weak forearm side panels. Refinished or factory flaw? In the picture below you can see how the forearm is wider than the receiver.

Has the flat topped studs that Savage was still selling at that time.

[Linked Image from p1.gunbroker.com]

“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