New answers tagged crack
That looks like fiberglass (if it feels pretty flexible its fiberglass, if it pings when you tap it with your wedding ring its porcelain) which could in theory be patched with a fiberglass resin patch. Use the kind with the fiberglass mesh, not just Bondo it will crack. Or you could try West Systems G/Flex Epoxy Kit WSY-650K, I've used it to do some hairy ...
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