Daggers were used as weapons, but also as utility knives, by foot soldiers. During the late middle-ages, the use of plate armor made wide bladed weapons less effective. Daggers got narrower blades, to be able to go between the plates.
This one is called a rondell dagger because of its rondell shaped knob and quillon.
Length 40cm. Fully tempered and forged blade. Hilt made of wood and steel.