Exchequer? Japanese Bantam

[AusHen]

Hi all. I purchased two breeding groups of Exchequer Japanese bantams for my son. I have never owned this breed or variety, so was looking them up on google and the two roosters colouring seems odd. Are they poorly marked Exchequer or mixed colour?

 

[MysteryChicken]

The roos look like a cross of Dominant White, & Silver Columbian(Black Tail White) colors.