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Ahhh, I see it now. Pretty big gap? I like the idea of Gary's method to repair them. I ended up using an aluminum backing when I did an ivory repair that was basically the same. I'll link if...

I'd clean it up as much as possible. Looks like lots of tiny pits/water spots or something rather than a nice patina. You can make it shiny and then do a vinegar bath or something to get the patina...