The easiest way to find out is to polish it a bit and then etch it in acid (ferric chloride, or, even better, is sodium bisulfate [NaHSO4]). That will let you know what you have. It's hard to tell from the photos; the corrosion pattern doesn't look especially like wrought though.
EDIT: If this photo is after etching, etch it for longer to know for sure.
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