I've got a 1936'ish 99R in 250 with the same two holes around the firing pin indicator, but mine doesn't have a hole on the front of the receiver.
It confuses me.
Jack's:
Mine:
“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