This sea bed recovered piece has suffered severe spalling of the surface metal, as is typical of untreated salvaged iron objects, it is not a result of very rough forging. I would suggest 18th or 19th century, it is difficult to say for certain but I doubt this would have survived over 300 years, more like 100 to 200. Without knowing exactly what type of underwater situation it was recovered from, how thick the encrustation, current movements, etc, etc I suspect it would be extremely difficult for a marine archeologist to put an estimate to.
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