Generally, the Model 99s made before serial number 1,000,000 are considered to be better made with a higher degree of quality than those made after the post mil (#1,000,001 and above).
The Model E (Economy) rifle/carbine was introduced in 1960 and discontinued in 1984.
The original Model E was a handsome rifle, cataloged as the Savage 300 and offered in .250 & .300 Savage with a 24-inch barrel. It looked nearly identical to the pre-1940, Model 99-EG with its long, slender, 1940-ish schnoble forearm, except that the Model-E had an uncapped pistol grip and a hard rubber (rather than a steel) butt-plate.
In 1961, the Model-E became the Economy Carbine with 20-inch barrels and a rather blunt forearm that was not nearly as handsome as the earlier Model-E with the schnoble forearm. It also lacked the cartridge indicator, tang sight holes, walnuts stocks and was offered in .243 and .308 with a 20 barrel while the rifles chambered for .300 Savage had a 24 inch barrel. The .250 Savage chambering was discontinued.
In 1962, all remaining calibers were available in a 20 barrel which was considered by many to be the Model 99-E Carbine. Impressed checkering was added in 1966. In 1981, the rotor in the rotary magazine was brass colored steel, but thereafter, it was steel colored.
The final Model 99-E version came with a Monte Carol comb and grooved forearm. It was the last rotary magazine Savage Model 99 offered. The .250 Savage caliber was reintroduced in 1983 and the E-Model was discontinued in 1984.
The original price of the Model-E was $99.95 in 1961 and rose to $251.35 by 1980.
I hope this information is useful to you.
Strength & Honor
Ron T.