Hello, I joined just so I could comment on this old post.
1) I received an email from Hermes that stated that "Please note that some parts of the handbags are machine stitch and some are hand stitch. " Feb 2012.
2) look at your picture. Note how you are right that most of the stitching is /////, but that in critical areas like where the handles attach to the bag the stitches are in the opposite direction \\\\.
I have been looking at fake and authentic Birkin handbags and this stitching in opposite direction is consistent. Where there is a the potential for rips (strap joints to bag, etc.) Hermes has the stitches in the opposite direction....I believe because this is when they are using the saddle stitch. Otherwise they are using a sewing machine.
I hope this helps. I have read that repairs are always made using saddle stitch as not to accidentally punch extra wholes, so to use existing ones.
