At one time this was a very major movement model, if not the largest single model. It was used by numerous makers, but the largest was the Emperor Clock Company of Fairhope, Alabama. Emperor during the 1970 period claimed to be the largest grandfather clock company in the US. There came a time in part because of quality issues that Emperor dropped Jauch in favor of the Hermle 451-050/94 cm unit which was very similar. Since Emperor was the largest customer of Jauch, Jauch went out of business shortly afterward.
Shown are pictures to help identify the 77. The give always on this model are really on the back. For many, but not all of them, there is a 77 somewhere on the rear plate with a separation and then another number. Not all of this model actually have a 77 on it, but most do. The thin leader with its built in beat adjustment is another indicator. It is hard to describe but this model is the only one that has a strike arm assembly that looks like this. The suspension spring is pinned, not screwed. In the upper corners, there are adjustable brackets to keep the hammers from flopping around in transit, but they can also be used to silence the clock.
Finally, the chime assembly is bolted on. Taken individually there are other models that have individual elements that are similar or accomplish the same thing, but taken together this model is unique. I might add that in the front are three holes for mounting the dial. To my knowledge that is unique.
In my experience the repair is usually frustrating as the movements usually have some kind of gotcha after one is done bushing and polishing the pivots. Hermle does have a kit for replacing it (#KITJ77). It comes with the shims, seat board screws, pendulum hook, etc., needed. The dial must be attached to the clock case or the frame that Emperor usually had. If there is a moving moon dial then the actuator or flipper must be adapted to the different hand shaft diameter. Butterworth does have one that is designed to replace it.