Parvin-class patrol craft

The Parvin () is a class of large patrol craft operated by the Islamic Republic of Iran Navy. They ships in the class are modified versions of "PGM-71" vessels, all built by the American shipyard Peterson Builders.
Design.
Sources differ in recording characteristics of "Parvin" class vessels. 
According to "Jane's Fighting Ships", the ships have a standard displacement of and at full load. "Conway's All the World's Fighting Ships" puts the numbers at and . 
The class design is long, would have a beam of and a draft of on the report of "Jane's", while "Conway's" mentions the dimensions as × × . 
Both sources agree that the ships are powered by eight General Motors diesel engines totaling that rotate a pair of shafts, but the engine models are variously cited GM 8-71 and GM 6-71. The system can reach a top speed of as stated by "Conway's", albeit "Jane's" mentions . The ranges given for the class are at and at .
Original armament of the ships reportedly included five guns: 12.7mm and 20mm each two and one 40mm. French sources give one 40mm and four 20mm machine guns, as well as a pair of Mk22 Mousetrap and DC racks. As of 2015, they are reported to be armed with five guns consisting an old variant of Bofors 40 mm/60, a couple of Oerlikon GAI-BO1 20mm in addition to two 12.7 machine guns. They are also equipped with four racks of depth charge (with eight US Mk 6), and two missile launchers of unknown type are installed on them after refit.
The original radar was model 303 of Decca Radar, while the current surface search system is known to be working on I-band. The sonar is a high-frequency hull-mounted active attack SQS-17B but is allegedly unlikely to be serviceable per "Jane's".
Crew on each ship of this class totals 20 officers and men.
Ships in the class.
The ships in the class are: