Well I may be wrong because I am new at this chicken love affair... but I have six americaunas that I got at my local feed store that look alot like that... 3 are dark with gold and 3 are gold with some black ... good luck will keep checking I am now very curious too...
I have 6 BSL pullets and they run in color from almost total black to 1/2 gold and 1/2 black. All have some gold on the chest. As chicks they had a black head and black body. I could only see gold on one chick. I'm told the BSL roo's have a white spot on the head, hence sex-link. I'm surprised how good they look, since they looked like baby buzzards for awhile. They seem to get more gold as they age.
I can get a current ten week old pic if you want it.
It looks like my black sex link girls. one of my 2 girls has just a little bit of red on her chest and I am not sure that my other girl has a single feather on her that doesn't have some red on it . . . . .