5 ships (modified Knox class) Santa Maria class - 6 ships (Oliver Hazard Perry class, built in Ferrol, Spain.) Álvaro de Bazán class - 5 ships Republic of China (Taiwan) (Republic of China Navy) Cheng Kung class - 7 ships Kang Ding class - 6 ships Chi Yang class - 8 ships (ex-US Knox class) Chien Yang class - 12 ships Thailand (Royal Thai Navy) Pin Klao class - 1 ship Makut Rajakumarn class - 1 ship Chao Phraya class - 2 ships (Type 053HT class) Kraburi class - 2 ships (Type 053HT-H class) Phutthayotfa Chulalok class - 2 ships (Knox class) Naresuan class - 2 ships Bhumibol Adulyadej class - 1 ship Turkey (Türk Deniz Kuvvetleri) Gaziantep class - 9 ships (Oliver Hazard Perry class) Muavenet class - 8 ships (Knox class) Tepe class - 4 ships (Knox class) Barbaros class - 2 ships Salihreis class - 2 ships (modified Barbaros class) Yavuz class - 4 ships Berk class - 2 ships Ukraine (Ukrainian Navy) Krivak-class frigate — 1 ship United Kingdom (Royal Navy) River class — 151 ships Colony class — 21 ships Captain class — 78 ships Loch class — 24 ships Bay class — 21 ships Type 15 class— 23 ships Type 16 class— 10 ships Type 41 Leopard class — 4 ships Type 61 Salisbury class — 4 ships Type 12 Whitby class — 6 ships Type 12I Rothesay class — 9 ships Type 14 Blackwood class — 12 ships Type 81 Tribal class — 7 ships Type 12M Leander class (Batch 1) - 8 ships Type 12M Leander class (Batch 2) - 8 ships Type 12M broad-beamed Leander class (Batch 3) - 10 ships Type 21 Amazon class — 8 ships Type-22 Broadsword class (Batch 1) - 4 ships Type-22 Boxer class (Batch 2) - 6 ships Type-22 Cornwall class (Batch 3) - 4 ships Type 23 Duke class — 16 ships United States (United States Navy) United States class - 6 original frigates of the US Navy 1797 to present (USS Constitution) Bronstein class - 2 FF ships 1963 (Transfer to Mexico actual ARM Bravo Class) Garcia class - 10 FF ships and 1 AGFF ship 1964 to 1968 Brooke class - 6 FFG ships 1966 to 1968 Knox class - 46 FF ships 1969 to 1974 Oliver Hazard Perry class - 51 FFG ships 1977 to 1989 Constellation class - 1 ship