Itaura and Ikauna (and I believe two others) built by W.Gray & Co, Hartlepool. 442' (loa), 426' (lpp), about 6797 GRT, 6128 Under Deck, 3670 NRT, Triple expansion with a LP turbine and DR gearing. All very similar except Itria (and I believe one other) was built by Barclay, Curle & Co, Glasgow and had minor cosmetic differences. Had same loa but an extra foot on perps, 427' (lpp) giving 6845 GRT, 6147 Under Deck. Same engines. 12 knots.
Both builders built similar ships for Clan Line, couple of which were snagged by MOWT and put in the Warrior name series. Not pre-fabbed but you could call them a kinda-sorta standard design. Itria is marked as "Class Contemplated" by Barclay, Curle. Top picture is Itria, then Ikauna, then Itaura. Darn similar except for stack and deckhouse details. Hope this helps.
Darn it, that Bowen fellow beat me to it.
< Message edited by JWE -- 3/23/2012 4:06:03 PM >