Honduran Notebook; sunken cannon...

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An Italian Swiss guy called Sylvano let me borrow his underwater camera so I could take this sequence of photos of the cannon which I have spliced together.
I have outlined the cannon in red for easier viewing. I have no idea what kind of cannon it is or what year it was made, but I took some notes so if anyone has any knowledge about these things, I'd really like to hear from them.