As to the safety type/location change from the lever safety to the tang safety, there was no unilateral change for all models at one given time.
As posted, first the "F" model was changed (about 1960), but by the mid-60's, all Model 99's were being made with the tang safety.
38.55: - Your .308 Model 99A was made from 1971-81, but Savage is not forthcoming with SN/DOM info.
AFAIK, if any info is available, it must be obtained ($$) from the retired Savage historian, John Callahan (google).
Last edited by PetahW; January 31, 2013 at 07:01 PM.