Here's an actual picture:
We're not taking about Dufour, the interior angles are hand finished in both cases, though. Just here they are more shallow on the entry level Breguet. Also, it is likely the hand finishing on this Breguet is just that: The finishing step--just as in the Geneva Seal (Breguet is not made in Geneva, but stay with me!)--the last steps in finishing are done by hand to remove all machine finishing marks. This is a reasonable level of excellence to expect from an entry level piece and what you find in various levels from Lange, Breguet, etc. And note that Lange avoids anything even remotely resembling an interior angle in their lower level pieces. Basically, Breguet is showing that they do traditional finishing, while keeping the anglage fairly narrow in their style. This is as opposed to a thicker anglage that is left entirely by machine with no handwork i.e. Patek.