Interesting. I am glad that you're making the extra effort, then. Hopefully other BCM breeders will too.Yes, this is the site and info I have been going by.
http://www.themaransclub.co.uk/french-standard-marans/4542061234
The BROWN-RED VARIETY
(Also called Black Copper-neck, Black Copper, Copper Black & Red Birchen)
Cock : Black-breasted red, with parsimonious red spotting on the breast. Having a black wing triangle. The red markings are not to be yellow or mahogany.
Copper coloured lancets in the neck hackle & the back. Deep red shoulders.
Hen : Black with red hackle markings but without the typical Birchen breast lacing. Very slight red breast marking is acceptable. Green sheen is not required.