Here's a 1966 99DL in 284, different checkering style. I was guessing that one to be an early one given the serial number (1,0xx,xxx would be 1965).

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“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