From what I have found the Weaver S mount was in production from around 1934. The T mount was added (or replaced the S) in 1939. The S mount only had two screws in each ring while the T had 4.
The first scope offering was shown in the Savage 1937 catalog. The scope that was available for the 99 was the Weaver 29-S in a Weaver S mount.
In 1938 the Weaver 330-S scope was added. It would have been supplied in the S mount till the improved T mount was phased in.
I think all of these dates would be + or - depending on catalog release date, production availability and units on hand.
The factory D&T was special order and was free with the purchase of a scope. I don't think the scope was shipped attached. The dealers would have sold the scope and mounts also and was probable more likely to have added the units than placing an order through a jobber and wait for a special order rifle. That might account for why we see so few mounts located in the same place.
Last edited by Rick99; 12/08/22.
