I'll try to answer your question from memory without looking up the exact details. . The most desireable Model 99 F, 308, were built from 1955 or 57 until 1959 and were under serial number 1,000,000. . They were built in the Chicopee Falls Mass. . They used a letter, inside a small circle, on the lever boss to indicate the dom and if memory is correct from 1955 to 1960, they are H, I, J, K, L.
In 1960 Savage moved their outfit to Westfield Mass. with model changes following as years past.
- tang safety - aluminum rotary mag follower - eliminated the cartridge counter - replaced the rotary mag with a detachable box magazine - low grade stock wood and poor checkering.