Based on an excavated dagger example from Dura Europa. This form of scabbard was common to 3rd and 4thC of the Roman Empire and consisted of a bronze front plate and leather liner with a curious shaped single edged blade.
Interestingly the plate and tang button are very similar to those found on Migration Era seaxs a few centuries later and also worn horizontally.
Single sided with a 20cm blade
Specification
Grip length – 11cm
Blade length – 20cm
Overall length – 31cm
Blade thickness at hilt – 6mm
Handle components – Bronze