Thanks Zeissfan. Interesting information. This camera is a bit of a mystery to me. There is very little info specifically related to this Favorit model.
I've only removed the front glass to access the shutter from the front since it was froze up, but I'm obviously hesitant to go deeper without a schematic or something to guide me.
Even so, the shutter now functions again, although still sticks occasionally in the slow speeds.
I can dry fire it all day long now, but I think I'll need to load it with film to test the film advance mechanism and double exposure prevention lock.