1959? Okay... That's holding on to a barrel a long time!
OP, look around for a date stamp then to date it. May not have one, but then again it might.
“
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