It's a 15th/16thC portuguese or spanish breechloading swivel cannon.
those 15th and 16th century breechloading cannons look all alike , like peas in a pot.
This type of gun is thought to have been cast in Goa, Portuguese India however they were also produced in Macao during this period.
they were made for the spanish and portuguese.
there are a lot of fakes on the market, whether yours is real unfortunately I can not tell from the pictures.
The core was held in the middle by thin iron wires, during the casting.
perhaps there are still traces of these wires showing on the skin. (small rust spots).
best,
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