Indonesian frigates built by Italian shipyard Ansaldo according to the Australia Station Intelligence Summary dated 8 May 1957

An item reported that the Indonesia 950 ton frigate Sultan Hasanuddin was launched by Anson, Leghorn, Italy. Her sister ship Pattimura was earlier by Ansaldo and now being fitted out. Dimensions 243 x 3 feet. Speed 22 knots. Similar to NATO frigates. Armament 2-7.62cm/3” dual purpose guns, 4 Bofors and probably anti submarine Hedgehogs.

Source

Website Royal Australian Navy, Sea Power Centre.