Hi Jon,

I have noticed this with one of my colonies that was mated in an apidea and moved near to other beekeepers bees. In our area no one as far as I know has brought in a queen so I don't know where it has come from. I have less than 50% and the orange banding is not as strong as you have i.e. Only one orange band.
I noticed it when I was collecting bees for wing morphometry. I did think at the time I should keep the black bees separate from the banded bees but thought this will influence the result. I might do this in the spring and see what I get from banded v black bees