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There’s the off chance that it just needs a clean,oil, adjust and a new mainspring.
It could be that the last person to work on it couldn’t source a new spring, and shortened the existing one because it broke .
Could also be something else in the mainspring barrel that’s rusty/gummed up and not letting the spring unwind fully.
I’m not thinking that it’s anything in the gear train, as the watch shouldn’t run 6 hrs if you had a bad/broken tooth.
The only way to know is to take it apart.
We’re ALWAYS gentle here,..that’s one of the nicer things about this group of folks.
Let us know what you find and how else we can help