Hello everybody,
I just discovered what I think is an interesting video!
The discussion about Hohner and the question “mass production yes or no” has recently been taking place here in the forum. 
I recommend watching the video until the end despite the 20 minutes!
I don’t know if it can be subtitled in English. I had it set accordingly, but subtitles weren’t showing up.
But even without subtitles, the work steps can be easily recognized.
Have fun!