The long-term restoration of this violin has finally come to an end. With the kind permission of the owner, I can show some aspects of it.
This area involved multiple cracks below the button area secured with a new patch from behind as well as replacing the non-original button, including the edges either side.
Iris Carr Restorations 
That’s called a button too? How many buttons does a violin have?
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One!
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I’ve heard the end pin often called a “button” as well; and *then* ChatGPT A.I., hedging its bets on *both* says,
“The “button” on a violin refers to a small, rounded piece located at the back of the instrument, just beneath the neck. It’s essentially the endpin of the violin, where the chin rest and the tailpiece are anchored. It helps to provide structural stability to the instrument. It’s not something you see easily when playing, but it’s crucial for the violin’s setup and construction!”
I suppose in Britland, the first sentence is the right one.
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I did think about the endpin possibly being called an endbutton after I wrote my reply!
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But A.I.’s answer was confusing as well, conflating both neck and pin in its answer. So now we have a bone to pick with artificial intelligence. Wishing you the best!
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So the button area is patched to reinforce the multitude of cracks and then a separate button graft is made over that? It looks seamless. Beautiful work!
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Yes, that’s correct. Thank you.
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Is the edge replacement there a part of the newly grafted button or a separate piece(s)?
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The edges and button are one piece.
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