Based on museum examples.  The dirk came into existence in the 17thC and the early forms were fairly plain such as this all bronze handled dagger with a long and powerful blade.

Single edged, with a false edge and a 40cm blade and comes with a leather sheath and bronze chape.

Specification

Grip length – 8cm
Blade length – 40cm
Overall length – 53cm
Blade thickness at hilt – 6mm
Handle components – Bronze