Very neat and well made. It looks like it was lost before it was used very much judging by the crossbar still being straight. I would think it would have bent fairly easily where the center "tine" connects to the frame.
Speaking of the center "tine", it looks like it had a 90-degree bend to the end where it connected to the crossbar so it could be locked into place by pounding on it with a hammer.
Can you tell what type of metal it is made of? (The corrosion makes me think iron but knowing it would be used around water, the maker might have used brass?)