I thought it was a lewmar low profile 03, and ordered a friction hinge kit to refurb it but the kit is nothing like this hinge set up, so I’m guessing its not the kind of hatch I assumed?
Strange and I would agree, it doesn't look like a rollstop, but it does seem to have the same sort of means of holding it up, namely teeth on the lid into which a bar locates. This, in turn, is spring-loaded by a rubber extrusion underneath it. That's the bit that ages and allows the lid to drop. SInce there are no spares, you can find rubber strips on eBay that can be trimmed to suit.