I was expecting to read about some relationship (ratio) between length of stock and shank, but I cannot see that anywhere. There must be a relationship so it sits on the sea bed at the optimum angle? Anyway, if you could find that out you could get the length of the shank and then work out the tonnage of the ship.
More than likely that artifact is associated with some calamity for some poor souls. Definitely so if a chain is attached, but the chain would be valuable and salvageable so probably not a reliable indicator.
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