Thanks, David. The double diamond 99C's look like they are under SN 109xxxx, and I've only seen 2. They were catalogued with double diamond the first year, but I think they were pressed checkering as soon as they went into full production.
“
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