One of my females has "Black Beauty traits" per her lineage and what the breeder has stated on her records and I have another girl that I believe IS a BB but there is not any lineage on her to know what lines produced that.
They both have the very dark coloring...the dark face markings, chin straps, and dark knuckles.
Pixie my "BB" has the very dark markings,almost as dark as your guy, but I have read that the gray underbelly is the difference between my girl who is a BB that has the gray underbelly and my girl with "BB traits" Bijou,(she has a creamy white belly).
I hope this makes sense...I just confused my self.