Looks like it might be a mottled cochin bantam. Where did you get it- did it come from a hatchery? If you know which, it helps because we can cross reference their available selection.
Not quite sure on hatchery then! I think they get them from different hatcheries, depending on the store.
My guess would be mottled- they have that yellow/white with black backs look to them, as well as he speckles around the eyes and face. There's an outside chance it could be black, as they sometimes get a few white primaries, but they don't tend to have that much white down, as a rule.
Here's my mottled cochin bantam chick, for reference. She's a week old in the photo below.
Her feathers are coming in just like your chick's are- black primaries over white primaries at the edge.