I posted pictures above of a couple 99R's with steel rotors, so they were on both. Not all 99's had the steel or case colored rotors in a certain range, only some. Brass continued to show up at the same time.

“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