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There are 13 Duke class Type 23 frigates of 4,900 tons displacement and 436ft long serving in the Royal Navy and a further 3 have been sold to the Chilean navy. They can sail in excess of 30kt and have a range of 7,500 nautical miles with a crew of 185.

Their main role is that of Anti-Submarine Warfare although they have been updated to carry out duties for general warfare
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TYPE 23 DUKE CLASS FRIGATES