I have khakis and that what they look like when they are getting there feathers. They usually have a little white under the chin, if its a ring it maybe a Saxony or a Khaki Saxony cross.
My vote is Khaki. The belly feathers look just like Rouen. However it is missing the coloring and stripes on the face that is characterisitc of a Rouen.
Yes, they never had stripes like the Khakis. They were all solid dark brown with the exception of one and it had a small yellow ring around it's neck. That one is looking like a male and I'm starting to see a slight green tint to his head feathers. I'll try to get some more photos of them this afternoon when I go out to feed again.
Warmly,