A very similar mid-15th century cast iron bombard (Steinbüchse) preseved in the Museum of Sursee, Switzerland.
Overall length: 41 cm
Cal. 15 cm, depth of 'bore' only 16 cm, meaning that the stone ball completely filled the bore and the muzzle area!
Breech 19 cm by 5 cm
Weight: no specification
Best,
Michael
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