No idea what the H's are, too early to be a model letter. An inspector stamp?
“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
99D’s were the continuation of takedown 1899A SR’s, and those were never plentiful. I think they got less common when the 99G in all common cartridges became available in 1921. Only catalogued as the 99D from 1921 thru 1927.
“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