BillAF84, at that low of a serial number all the 1899's had the side panels with pointed ends. The 1920's 99H and 1960's 99E models didn't have the side panels, but all others did.

Originally the stock would have looked like this:

[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