Hi Alexender,
I knew you'd like it right away.
Attached please find two very similar but slightly 'younger' Nuremberg haquebut barrel of ca. 1470-80, (because the touchhole has moved a bit more to the right), also hexagonal, with tiller sockets, and retaining much of its original minium paint.
The first is preserved in the Bavarian Army Museum Ingolstadt, and the only date I have is the overall length: 86 cm, inv.no. W363.
Best,
Michael