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It is not unlikely that armourers, with their proven skills in working and articulating metal to the forms of the human body, would have been among the first craftsmen to involve themselves in the manufacture of functional artificial limbs. In the case of the hand shown here, both the thumb and the paired fingers are capable of being independently locked in several positions by means of an elaborate system of ratchets and spring-operated pawls that can be instantly released by pressure on a push-button protruding from the back of the hand.

The earliest surviving hands of this kind are those made for the celebrated Franconian Knight, Götz von Berlich (circa 1480-1562), raised to heroic status by the young Goethe in his childrens’ drama of 1772. Two are preserved in Schloss Jagsthausen, and a third in Schloss Grüningen bei Riedlingen. They were clearly made after 22 June 1504 when the twenty-four year old Götz lost his right hand to a cannon ball at the siege of Landshuf, but probably no later than 1512 when a prisoner of the Nuremberg campaign recorded that er hab auch Gotzen von Berlingen mit de rein hend aigentlich gesehen, hab an der eysinen hand ein handschuch gehapt (he personally saw Gotzen von Berlingen with the one hand, having had a glove on his iron hand). With his ‘iron hand’ Götz distinguished himself in a long active military career. According to a verse composed by Count Franz Pocci in 1861, it allowed him to securely grip both his lance and his sword. The earlier of the two Jagsthausen hands is constructionally very similar to the present example.

(via myArmoury.com - View topic - Prosthetic Hand, circa 1580)