Nope, we're not talking case colored rotors.
1) We had a very few early 1899's with "other-than-brass" rotors that have shown up, as exemplified by Lightfoot's photo. As Lightfoot says, they seem to be really early rifles.
2) I think we've heard of a few WW2 era 99's show up with steel rotors?
3) We had the early 50's case colored steel rotors in EG's and R's.
4) We have the post-1960 aluminum rotors.
5) I have no idea why a non-brass rotor would be in a 1920's rifle as Gunplummer says he had, that's a new one. But never say never.
This thread is only about the early 1899's.
“
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