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S'not a belaying pin. Those are shorter and fatter. It might be a handle for a tiller but those are most often not round. What makes you think it is part of a boat?
tiller extension for a small sailboat is my guess. My daysailer has one kinda like that. Most have a Ujoint on the attachment end, but maybe that had another connection.. Thats my guess anyway
Do a Google search for Wood Burgee Pole. A burgee being a nautical pennant or flag, usually denoting membership in a specific yacht club. You will see numerous pics of exactly what you have. "burgee pole".Patrick HayesFremont CA
I think its a temp ensign/flag/burgee pole. The metal end goes on a hole. At first I though it was a whisker pole for poling out the jib but its looks too short.Kev