This seemed to be popular in the 15thC Bohemia and Germany. The whole item is clearly a bit of a violent Medieval joke, with a heavy bronze fist holding a steel dagger.
You will see a few examples in Museums and manuscripts, most notably Talhoffer.
Material – bronze and steel (EN24)
Height 13cm, width 18cm
Weight 1000g
Height 5 ¼”, width 7”
Weight 2lbs 3oz (unmounted)
Available unmounted or on a 50cm/20” ash shaft
SIX WEEK LEAD TIME