French Black Copper Marans. They are black with 'copper' feathers at the hackles. The 'French' BCM have feathered feet/legs. The 'BCM are clean legged.
(Think: British like to shave their ladies, - so clean legs, the French are fine 'oh natural', so don't. Non-feathered vs feathered legs.!


Hope that stereo-typical analogy works (even if it really isn't true.)
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That said, mine are FBCM, but the feathering on their legs is pretty light - I suspect that they are a mix of BCM & FBCM, as the French Black Copper Marans are heavier feathered on the legs, usually.
More like this hen:
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Cackle Hatchery
French Black Copper Marans Chicken Breeds ...
https://www.cacklehatchery.com/product/french-black-copper-marans/