Motor torpedo boat PT-657 is a PT-657-class Higgins 78-foot (24 m) PT boat, built for the United States Navy during World War II. PT-657 was built at Higgins Industries in New Orleans, Louisiana. PT-657 part of United States Navy order for boats: PT-625 to PT-660. PT-657 was laid down on 16 February 1945, launched on 2 April 1945 and completed on 21 July 1945. PT-657 was scheduled for transfer to the Soviet Union on the Lend-Lease act, but the war need before the transfer and the transfer was canceled. With the war ending on in September 1945 and no need for PT-boats, PT-657 was struck as a PT boat from the Navy Register on 28 November 1945. Later sold off as a charter fishing boat Malihini in San Diego, California.

This group of PT boats was delivered to the US Navy 31 July 1945 and was to be part of PT Squadron (RON) 45. PT-657 on a LST ship going from New Orleans to Seattle when the war ended. The LST ship returned to New Orleans. ' On 14 November 1946 PT-657 was transferred to the War Shipping Administration 14 November 1946 to be sold as surplus. PT-625 was sold and converted to a charter fishing boat, in a non-historical configuration. She is now owned by William Wilkerson of San Diego, operating out of H & M Landing, San Diego, named Malihini. The word Malihini is a Hawaiian word meaning a foreigner, a stranger or newcomer to a place.

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  ELCO and Higgins PT boats, Know Your PT Boat US Navy July 1945
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  PT Boat 50 cal. gun M2 Browning
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  PT Mark 8 torpedo

• List of museum ships
• Patrol torpedo boat PT-658 sister boat
• Patrol torpedo boat PT-617
• Motor torpedo boat PT-796
• Motor torpedo boat PT-658

32°43′24″N 117°13′40″W / 32.723333°N 117.227667°W / 32.723333; -117.227667