I was just about to comment on that. Though the APA SOP for Marans calls for feathered legs, originally birds conforming to both French (feather-legged) and UK (clean-legged) Standards were imported to the US. Both varieties are still seen. Clean-legged birds were originally more popular here fifteen years ago. Feathered legs have gained in popularity and that is what the APA members that showed the birds pushed for when getting them accepted to the Standard. Personally I much preferred the clean legs myself.
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As for the bird in question, it does look Cream Legbar-esque. But I don't see a crest which usually you see in crosses.