Thanks all.
The issue now is that callosum has 4 named varieties; callosum, sublaeve, warnerianum and vinicolor. How one differentiate between those is anyone’s guess. The designation thailandese was used to group the ones bred from recent Thai discoveries.
On top of this confusion is the barbatum, which looks like callosum, and has a miniature variety nigritum.
The one here I think is the sublaeve type, a smaller version of callosum.