We have 2 Heritage RIR and we have some "other" RIR's as well. The Heritage RIR are from a local farmer who has been breeding them for over 30 years and wins at all the shows and fairs He travels to the Boston show as well and usually wins.
When selling other chickens off our little farm everyone is fascinated with our 2 Heritage. They glisten in the sun and are such a deep mahogany red. That is the key - the mahogany gene.
We also have 4 other RIR's that are not as dark - from a different farm - they do have some mahogany as well and they lay a very dark terra cotta egg. Production or commercial RIR are very diluted in color and the focus is on egg production. The heritage are very heavy and mature much later.
Here are the four with a mahogany gene but not pure heritage:
Here are the 2 Heritage RIR - very rare to see these so well bred and I paid for them believe me! You should have seen his rooster - like out of a painting!