In your last 2 pics you can see that the ends of the lands are chamfered so what you appear to have is a 90* crown. Now if you spec'ed out something different then there is an error. Many smiths will thread barrels and use a 90* crown. I know older custom target barrels (60's-70's) would use such a crown. My grandfather had several custom built target rifles that had them.
As for your brake, the dings are between you and him. If you spec'ed that he use a shim kit, and he used a crush washer then yes, it is not what you ordered. If you did not spec one way or the other, a crush washer is an accepted way to mount a brake in many circles.
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