It's a Savage customized 99.. I'd have to go with leaving it as is. By the time you got done putting it back to "original", the only original piece would be the action. I'd display the older one you have and this one side by side with a writeup on the history.

“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