Motor Torpedo Boat PT - 658 Motor Torpedo Boat " PT - 658 " is a " PT - 625 " - class Higgins PT boat , built for the United States Navy during World War II . " PT - 658 " is a prime example of US Navy Motor Torpedo Boat development during World War II . " PT - 658 " was in the last group of four boats delivered from the 36 - boat contract NObs - 1680 , October 1944 for " PT - 625 " to " PT - 660 " . Delivered and accepted on July 31 , 1945 , she was fitted with all of the latest armaments and design modifications as a result of lessons learned from previous contracts and battlefield experience . In this way , " PT - 658 " is a showcase of the final form that Motor Torpedo Boats would take by the end of World War II . " PT - 658 " was listed on the National Register of Historic Places on September 4 , 2012 . Of three PT boats listed on the National Register , she is the only one maintained in operating condition . Service history . " PT - 658 " was one of a group of PT boats assigned to MTB Squadron 45 in April 1945 , for transfer to the USSR under Lend - Lease . By the time she was completed on July 30 , 1945 , this transfer had been cancelled . " PT - 658 " was transported to Bremerton on the deck of " LST - 375 " from New Orleans along with " PT - 657 " , " PT - 659 " , and " PT - 660 " , arriving on September 25 , 1945 . " PT - 658 " was then stationed at Port Hueneme , California , where on August 27 , 1946 , she was reclassified as a Small Boat and renumbered C105343 to serve as a missile range patrol boat . On December 3 , 1948 , she was reclassified as Floating Equipment . " PT - 658 " was then transferred to Naval Air Station Point Mugu , reclassified as " RCT - 13 " , and used for patrolling the Point Mugu missile test range for stray craft into the missile landing area , and for towing targets . Also during this period , " PT - 658 " served twice a week as a high speed transport , carrying men and supplies to the USAF D . E . W . Radar Station on Santa Rosa Island , off the coast of Los Angeles in the Channel Island Group . " PT - 658 " s survival has been attributed to her completion late in the war , and that she was never sent overseas . On June 30 , 1958 , " PT - 658 " was sold to a private individual in the Oakland and Alameda , California area and renamed " Porpoise " . The private owner changed very little of her structure during the time he owned her . In 1993 , she was donated by the late owner ' s estate to the veterans of Save the PT Boat , Inc . of Portland , Oregon . " PT - 658 " was transported from Alameda to Portland in May 1994 by the 144th Transportation Unit of the Washington National Guard on the deck of the US Army Logistics Support Vessel . Restoration . A dedicated group of PT Boat veterans formed the organization Save the PT Boat , Inc . , a 501 ( c ) ( 3 ) non - profit organization . The group restored " PT - 658 " to her original 1945 configuration between 1995 and 2005 . " PT - 658 " is now fully functional and afloat , the only restored US Navy PT Boat that is operational today . " PT - 658 " s restoration included a full armament of four Mark 13 Torpedoes , two twin . 50 caliber Browning M2 machine guns , a 40 mm Bofors cannon , two 20 mm Oerlikon cannon , two eight - cell Mark 50 Spin Stabilized 5 inch Rocket Launchers , and two Mark 6 TNT depth charge s . She has three working Packard Model 5M - 2500 V12 gasoline engines . " PT - 658 " is located in Portland , Oregon at the Swan Island Navy Operational Support Center Pier . " PT - 658 " is open to the public on Mondays and Thursdays almost every week when the crew is there for maintenance . She has been moved into the new boathouse and the group continues to raise money for ongoing projects such as deck replacement , charthouse repair , and bottom replacement . Money is also being raised for final boathouse improvements and to build a " PT - 658 " Heritage and Education Center . In May 2010 , replacement of the deck was completed in time for various summer festivals and shows . Funding raised for additional restoration work included a $ 14 , 000 grant from the Oregon Cultural Trust , awarded in July 2010 . When originally launched in 1945 , " PT - 658 " wore a camouflage paint scheme , and this was restored in early 2011 . In July 2011 , two Mark 50 eight - cell rocket launcher mounts were added to the port and starboard bow . In May 2012 , an original SOA Radar mast ( obtained on loan from PT Boats Inc . of Germantown , Tennessee ) was installed along with an appropriately sized radar dome , signal generator and waveguide . Simultaneously , the 40mm Bofors cannon mount was improved with the addition of an ammunition clip holder / loader handrail to the rear of the mount , along with adjustable seats and authentic aerial spider type gunsights .