▁production ▁of ▁the ▁Mark ▁IV ▁was ▁by ▁adding ▁extra ▁arm our ▁to ▁Mark ▁III . ▁Later ▁production ▁included ▁the ▁extra ▁arm our ▁at ▁the ▁time ▁of ▁construction . ▁On ▁top ▁of ▁those ▁converted ▁from ▁the ▁M k ▁III , ▁ 6 6 5 ▁of ▁the ▁M k ▁IV A ▁( with ▁the ▁B ES A ▁rather ▁than ▁a ▁V ick ers ▁machine ▁gun ) ▁were ▁built . ▁ ▁T ank , ▁Cru iser , ▁M k ▁V , ▁C oven anter ▁( A 1 3 ▁M k ▁III ) ▁The ▁C oven anter ▁was ▁an ▁un success ful ▁design ; ▁a ▁result ▁of ▁suffering ▁from ▁engine ▁cool ing ▁problems . ▁Total ▁production : ▁ 1 , 7 0 0 . ▁No ▁A 1 3 ▁M k ▁III ▁saw ▁combat ▁as ▁all ▁but ▁one ▁( which ▁was ▁sent ▁to ▁North ▁Africa ) ▁were ▁station ed ▁in ▁Great ▁Britain ▁during ▁the ▁war ▁and ▁used ▁for ▁training . ▁ ▁T ank , ▁Cru iser , ▁M k ▁VI , ▁Cr us ader ▁( A 1 5 ) ▁The ▁last ▁production ▁Cr us aders ▁were ▁produced ▁without ▁tur rets ▁as ▁they ▁were ▁to ▁be ▁converted ▁to ▁art illery ▁tra ctors ▁or ▁self - prop elled ▁anti - air craft ▁guns . ▁ ▁Total ▁production ▁ 1 9 4 0 – 4 3 ▁of ▁Cr us ader ▁M ks ▁I , ▁II ▁and ▁III : ▁ 5 , 3 0 0 . ▁ ▁T ank , ▁Cru iser , ▁M k ▁VII , ▁Caval ier ▁( A 2