A new ring is brazed. Look at (6). The edge gets its steps for the casing flange. (8) The rim from below, it is a wide margin. Visible also some silver solder. An inner chamfering, like the origin shows, is still missing.

Many cutouts are finished:
(7) for the dog screw (9, 10) for the hand-setting, (11) for the winding stem bridge, (12) for the barrel.