Numbers I've been able to find: mepla hinge part 591 290 00/00 mepla hinge 346.290.51.00
Round hole mounts...
As you can see in the picture, only the small pot metal piece that holds two parts of the hinge together is broken. But I realize it's unlikely to find only that part.
Casey from SWISCO responded:
August 12, 2021
Hello,
We can only provide complete hinges rather than small replacement pieces but take a look at the 32-349 hinge and see if this could be a good match. Thank you!