Thank you for so much information Rain. Do you know of any look-ups for the Serial Numbers on these German 206's? You're right about being heavy! It's definitely cast iron. Luckily, I don't have to tip it back to change the bobbin. I don't guess it shows in the photo but the cabinet has a unique pivoting cover on a round hole that I can reach in under the machine to change remove and replace the bobbin.
I have so much to learn. I have no idea what some of the accessories are for. Since this is my first vintage machine I'm just sitting back and admiring right now. I want to clean it up but I want to make sure I do it correctly so I don't damage anything. Everything seems to turn freely but it has been well used. If you know of any good sources of information for me, please pass it on - especially anything specific to the 206. I just subscribed to your blog so I'm sure I will learn a lot there.
Joyce