Originally Posted by Matchlock
Now this is Berne inv.# 2193. See Rudof Wegeli: Inventar der Waffensammlung des Bernischen Historischen Museums in Bern, vol.4, Feuerwaffen, 1948, p.153f.
As the text mentions, the hook is of iron and hammered through the stock as an addition in the gun's working time. As this must have proofed less stable, hooks were fire welded to the barrels from ca. 1440-50.
My library of more than 3,000 books and catalogs contains the complete original edition of the Zeitschrift fuer Historische Waffenkunde from its origins in 1897 until today. I have been a member of this society for more than 25 years.