These are sockets for the filming ‘shelf’ that was attched to allow the crew to film the scene from outside the boat. There are similar sockets along the sheer line. They are made from 1/2″ internal diameter tubing welded to a plate. they were waethered to look part of the boat.
There is an image of the filming ‘shelf’ attached to the side of the boat here vhttps://www.vintag.es/2013/09/photos-of-behind-scenes-of-jaws-1975.html (9th picture down)
Great job spotting this Andy. We will research this more.
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