Precision Steel Dagger in turned wooden dark wood sheath.  Clipped close with a spring.   Please note there is a small crack on one of the sections which open.    A well made professional type of dagger in excellent condition. Questions welcome.

From Wikki:  The rondel dagger is a stiff-bladed fighting knife popular in Europe from the 14th to the 16th centuries. It gets its name from its disc-shaped (rondel) guard and pommel. It was primarily designed for military use, optimized to pierce mail, puncture thick clothing, and slip through gaps in plate armor.