I don't remember if northern has such pattern on their stripes but definitely not an Indonesian. I have a Merauke which is a subspecies to Eastern Indos but appearance wise they are very similar. If the front legs are mostly or all dark, more than likely an Indo. If the stripes are skinny and dark, most likely an Indo. And for Merauke especially, their pink bellies as adults is a sure sign that it is no northern.