What mutation are these zebras?

[Vargur]

The male is not ob, only bb.
If male bird is both bb and ob, he will show only the orange color,
because the ob mutation removes the black color.
BB mutation will make the cheeks larger and makes the chest all black, hence the name.
The flank spots will also become larger.

And he is very pretty!

[DanteD716]

Looks like a black breast pair to me

[wellingtoncdm]

Looks like a black breast pair to me

I though black breast hens had no tear?

[DanteD716]

They have no tear,or lack of a tear... This hen has a pretty narrow tear, and her bars are missing on her tail

[Vargur]

thin tear could indicate split for bb and ob.

Dante: the hens tail is plucked, time will tell how her tail is gonna be
when its grows back

[DanteD716]

thin tear could indicate split for bb and ob.

Dante: the hens tail is plucked, time will tell how her tail is gonna be
when its grows back

You are right, the tail is plucked
I am guessing ahead of time /BB, when her tail grows we will be able to tell!

[tinysparrow]

they are a beautiful pair!