Hi Peacock ... sorry, Mich'l,
Stupendu (latin for astounding).
Afraid of this not being the just adjective for this specimen, i would add that, if one engages in a contemporaneous confrontation, one may place this cannon on the front line and his foe will realize this is an active boca de fogo (portuguese for fire mouth = cannon); so much for its half millenium age.
Another thing in your collection that, when i am grown up, wish to have a similar one
It is a superb piece indeed.
The Counts of Giech may rest in peace; this wonder is in good hands; so good as the next ones ... when i inherit it
Dramatic image, that of the Nuremberg example bursted by savage ignorant misuse