1. How acuratly does the movement run?
you can expect something in the order of +/- 20secs per day, perhaps better, but it will vary a bit like all automatic movements.
2. Is the bracelet tapered?
the bracelet on my GMT Ocean 2 is a constant width (22mm) from lugs to clasp.
3. Is the debaufre site the manufacter selling the times pieces or a third party?
Debaufre doesn’t manufacture watches, but rather has them “made to order” by a number of watchmakers under a “private label” scheme. I believe that the Ocean series are manufactured by Grovana (a Swiss company).