The centre dice is definatly green,only royal regiments are blue and the Argyles or 93rd at that time who are only red and white.I hope this helps.This seems a common mistake with highlanders

I know bill horan did his own version of this some years ago,

one of the first I saw of any soldier in the cape.

Bill did the dice border different to us all.

Look !

Bugger!

Paul

The 91st were not a Royal regiment so the dicing would have been green but as has been said it's so dark that it's almost black in that small size.