Hello ! Centurion MK 13's had a flat mantlet, a " split "commanders hatch , and " pagoda " type louvres on the engine , and transmission decks , ( the rear of the hull), and a internal 100 gallon fuel tank.The Tamiya Centurion is based on a MK3 ( early Cent), MK5's had the periscope for the loader , moved forward to the sloped part of the turret roof, the BESA MG exchanged for a Browning, the loaders hatch repositioned , different stowage bins on the fenders,and the hatch on the turret rear removed.Centurions were made in 3 basic types. MK3/5 , MK 7 , and MK 8. MK 3/5 Cent's = Mk's 5/1, 5/2, 5/3 , MK6 , 6/1, 6/2, MK 11( Yours), MK11(LR). MK7 = MK's 7/1, 7/2, MK9, 9/1, 9/2,MK 12 . MK8 =8/1, 8/2, MK 10 ,10/1,10/2, and finally MK13. The differences between sub -marks is the change from a 20 pounder gun , to a 105 mm, the addition of a ranging gun , and IR. Some marks include , " All of the above".
or a combination of these. A good reference is " Modern Combat Vehicles 2 Centurion" , by Simon Dunstan. Again happy modelling.
Frank
" PERSEVERANCE"