Educated guesses

[Barry42001]

Might be mistaken thought was a cross with the only viable rooster at the time a black austrolorp and a Rhode Island red. Now I'm thinking it's a cross between that same black Australorp and a buff orpington thoughts

 

[oldhenlikesdogs]

Has yellow legs, so there must be a yellow leg parent, so not Australorp and buff Orpington, that would make dark legs or white legs. The RIR must be involved.

 

[Barry42001]

Only Roo is black austrolorp, only question is which hen either RIR or Buff orpington

 

[oldhenlikesdogs]

RIR, due to the yellow legs.