It has a "Sporting rear sight with elevator", basically a sheet metal stamped sight. Often removed, or the elevator removed because they get in the way of sights.

Here's a picture of one.. with the elevator removed.

[Linked Image from images.gunsinternational.com]

Another option would be a folding leaf sight which came on the 99E/S (which was a 99E which had a Savage scope also in the box).

That would look like this.

[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