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Looks like double lacing to me. In a single laced feather only the outer rim is black, the rest of the feather is ground coloured. In a partridge chicken, the outer rim is ground coloured, not black.
You can't easily breed the exact same bird, or one that finishes as quickly, since the commercial meat hybrids took decades to produce- but you could start with good meaty strains of white cornish crossed with white rock.