1) So it rotates on a fastener on the short end, actuating a latch on the underside of the hatch?
2) Or did the right hand end in the picture use to look like the left hand end, so it is just a straight "pull-upwards-here-to-open-hatch" type of arrangement?
3) Is this a vent hatch in the cabin roof, an anchor locker hatch, or what?
If the answer to #1 is yes, I would search marine vendors for "locking latch handles", "hatch locks", or similar terms.
If the answer to #2 is yes, I would search marine vendors for "pulls", "locker pulls", "cabinet pulls", "hatch pull
There is an small chance that a search for "lifting rings" would get you in the right section of an online store. You could also call Marlow/Hunter. If it is for a vent hatch, you could also call the maker of that hatch. Good luck.