Dear 'Nando,
Thanks a lot for the additional information.
If this gun was not some kind of grenade thrower I still believe it was designed for very special use, as both the brass barrel of rather short dimensions and the caliber of 25 mm are far from being consistent with a regular musket.
Anyway, I will do some research and let you know soon! It should most probably be called some kind of blunderbuss for firing unusually coarse shot or, even more probable, firework items ...
Best,
Michl
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