Hi
on my background, synthetically I classify as follow the daggers with short and curving blade
- dagger with 90° angle scabbard as from Saudi or Emirati, or Omani
- dagger with 180° angle scabbard as from Yemenite
- dagger Saudi 7 rings on scabbard
- dagger Emirati and Omani 4 rings on scabbard
- dagger Yemenite, no rings
- all have the same type of blade (more or less)
double edge with a thick central rib
it's not a truth "formal"
according with the bearer's residence
if ... more or less near of borders,
the shape could be significantly different,
what's on above is valid as general rule
at my point of view
à +
Dom