The FriedrichFiles - Patrol Boat Mk. IV (PB Mk. 4)

numbers:
PB 851
PB 852
PB 853
or
PB 731
PB 734
PB 735
PB 751
PB 755
PB 757
PB 758
PB 759
PB 775
PB 776
PB 777
PB 778
PB 841: 1985
PB 842: 1985
PB 843: 1985
dimensions: 64,1x 18,07x ___ ft
speed: 27 kts
FY: 1984
armament: 2x 2,5; 2x 4,0 grenade launcher Mk. 19 Mod. 3; 1x 8,1 mortar/1,27 MG-combination mount

When did these craft enter into service?

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