No writing on the sight that I can see, and that rear portion is pretty thick with a shallow curve in it. I'm not a sight guy, but I think it'd be tough to find one similar to modify to look exactly like this.
“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