That restoration work on the speaker and the paper box is so well done. I spent some time under the Rijksmuseum in the workshops and the people there are similarly skilled and it was very impressive to see them at work, infinite patience and the result of all that work as invisible as possible. That's the bit that really got me, good restorers don't have any fingerprints, their biggest successes are the works that look like they were never worked on in the first place. Which is almost the opposite of every other form of creative art, and yet, they are amongst the best in the field.

That transformer from last link about the phone looks like it was made yesterday.