The G&H looks aftermarket, the screws aren't ground down and blued to blend in with the receiver.

But... That isn't just a 99R, with the studs that seems be a 99RS. It is the 1930's style of 99RS, and if all parts number I'm pretty sure it's the latest one we have information on. That's cool! It probably didn't originally have the tang sight, it probably had a Redfield 70LH receiver sight - but that had to go when the G&H scope mount was put on.

The 99RS was different from the 99R by having sling studs with a flat bottom, sling swivels and sling, and a peep sight.

SWEET! That's a new one, it being above 500,000. It answers the question of what was Savage sending out as R's for those couple of years.

Here's a 1930's 99RS without swivels or sling:

[Linked Image from savagefest.net]

“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