6 5 8 ▁the ▁du cal ▁house ▁divided ▁in ▁two ▁branches : ▁Me ck len burg - Sch wer in ▁and ▁Me ck len burg - St rel itz . ▁ ▁The ▁flag ▁of ▁both ▁Me ck len burg ▁duch ies ▁is ▁tradition ally ▁made ▁of ▁the ▁colours ▁blue , ▁yellow ▁and ▁red . ▁The ▁sequence ▁however ▁changed ▁more ▁than ▁once ▁in ▁the ▁past ▁ 3 0 0 ▁years . ▁In ▁ 1 8 1 3 ▁the ▁duch ies ▁used ▁yellow - red - blue . ▁ 2 3 ▁December ▁ 1 8 6 3 ▁for ▁Sch wer in ▁and ▁ 4 ▁January ▁ 1 8 6 4 ▁for ▁St rel itz ▁blue - yellow - red ▁was ▁ordered . ▁Me ck len burg - Sch wer in ▁however ▁used ▁white ▁instead ▁of ▁yellow ▁for ▁flags ▁on ▁sea ▁by ▁law ▁of ▁ 2 4 ▁March ▁ 1 8 5 5 . ▁ ▁Sie bm ach ers ▁W appen buch ▁gives ▁therefore ▁( ?) ▁blue - white - red ▁for ▁Sch wer in ▁and ▁blue - yellow - red ▁for ▁St rel itz . ▁According ▁to ▁this ▁source , ▁the ▁grand ▁du cal ▁house ▁of ▁Sch wer in ▁used ▁a ▁flag ▁of ▁ 3 . 7 5 ▁to ▁ 5 . 6 2 5 ▁M ▁with ▁the ▁middle ▁arms ▁on ▁a ▁white ▁quadr ant ▁( 1 . 7 5 ▁M ) ▁in ▁the ▁middle . ▁ ▁The ▁middle ▁arms ▁show ▁the ▁shield ▁of ▁Me ck len burg ▁as ▁arranged ▁in ▁the ▁ 1 7