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Of course, this thing is only 4’ long. Could be a 6-lber (why don’t they ID it that way?) or any other small-bore field cannon. Not sure about naval cannon; did they make small cannon like 6 lb (never mind swivel guns)?
I definitely wouldn’t discount this cannon, if it really is that old, being mounted on a much-later craft. And simply was jettisoned or “lost”.