Trigger
Bob Kingsbury,
Sounds as though you have a standard Winchester Micro-Motion trigger that came on the 52"C", "D", "E".
That small lever is the "rocker" and the sear loads that on the "middle lever". Pushing the trigger forward applys pressure to the sear "TAIL" as cocking would. The word "sear" on the pic points to the sear adjustment screw, not the sear.
Bob Finger,
I believe you are correct in that the brass post is a replacement on the Kenyon. Karls post was of steel and fastened differently. Most position shooters liked the post and its ability to adjust for LOP. He also made a two stage unit to replace the post in that Kenyon light model.
I think the blade you refer to as "anschutz", which really isn't close, was put on his later triggers, not the majority, which were curved (Kenyon standard) or the post style (Kenyon light).
bjm