Restoration of Early 1900s Electric Door Bell

In this video I'm going to restore an antique German electric door bell.
I've bought this door bell from an online auction for $45. It was in pretty rough condition, but it was still working, kind of. What I first saw as a quick and easy project turned out to be a really tough and time consuming challenge. Remaking the broken copper part needed a lot of trial and error until I have finally managed to completely recreate that part. Not just making the jig, also the engraving and tumble ring. The coils were very tricky as well. At first I planned just to clean them as they were still working, but I've quickly realized that the insulation was damaged and I had to rewind them. Although low voltage isn't dangerous rewinding was necessary to get the job done 100%. It was a good idea though, as the iron cores have been completely rusted under the copper wire. Rewinding required a lot of testing too until I got a satisfying result, as it was my first time doing it. Finding the old newspaper was very cool and even better to actually find a date on that newspaper „1902“. A follower on Instagram was actually able to find that newspaper from 1904 when it was printed. It was actually a patent description. If you click the link below you're actually able to find the exact patent with the exact same text like you can see in the video on the newspaper. With all this information this door bell must have been built somewhat around 1904-1906 in Germany I guess.

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