just got to add this little comment also
there was so many questionmarks when I looked at the picture so I checked the link also
first it got center mounted trunnions ( Atocha sunk 1622 )
the muzzle profile isnt late 1500 or early 1600 style
the carriage design is wrong for the time period
but when I read on the website about the "Atocha" cannon they say that this cannon is similar in shape to an atocha cannon
ok its a nice cannon and carriage , but I dont think it actually have any similarities with any of the barrels that was recovered from Atocha
at least not more than that it is a tubular shaped bronze piece with one end plugged