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On the sign:
Admiralty-pattern anchor from a ship of the line, about 1750
This was recovered off Sheerness, Kent, and was probably lost from a naval vessel- using this famous anchorage. The original stock was completely studded with nails to protect it from shipworm. The present oak stock is modern.
The sharp angle between the arms and the shank, and the pointed crown, show that it was made before improvements in the strength of iron used for anchor forging about 1800, and the introduction of the steam hammer for welding around 1830.
These anchors frequently broke at the throat and had to be returned for repair. This example is typical of the anchors used in the larger types of man-of-war.