The photo is a bit dark to tell for sure, but based on what I can see and your description, I'd say Barred Rock. Also, you mentioned that the legs are the same color as your Golden Sex Link. Red Sex Links (Golden Sex Links) typically have yellow legs.I got some better pics of the legs - the black speckly girl does seem to have some yellow on the legs, and also some black/grey.
Barred rock?
