This is a rubbing of a stone mural from a Jin Dynasty tomb dated 420 AD.
Here we see a mystical being with an animal head and a body of a man holding a ring pommel dao and a Gou Rang.
This was the last image of Gou Rang from antiquity and Gou Rang got lost in the veil of history from this point on.
For the next 1600 years, no one knew what a Gou Rang looks and how a Gou Rang could have been used.
LK Chen demonstrate the use of the Gou Rang in Han Dynasty Swordsmanship system