This cannot be straight Maudiea, lawrenceanum x callosum.
The leaves, flower (shape, color, dorsal color and patterns, the staminode, petals and everything) indicate that this has charlesworthii mixed in its genetic make up.
so the only 'maudiae type' "Black Jack" is Paph. Hsinying Black Jack (Paph. Black Cherry x Paph. Laser). It could be that, a complex Maudiae type. But it does look to have charlesworthii in it.
I think they are selling vinicoloured Maudiae type flowers ie not pure Maudiaes.
Possibly P. charlesworthii x P. Maudiae vinicolor which is actually P. Schaetzchen. In Google you can find a lot of sites(mostly european) calling this type of cross P. Black Jack and they are clearly charlesworthii x vinicolor crosses. The Black Jack seems to be more of a catchy generic promotional name.
Sorry for the slight delay but here are some more photos. I've shot these with flash and some in daylight and flash so quite over-exposed to show some underlying features.
Can certainly see traits that could be Charlesworthii.