"Broken" scales?

If they are only cracked a tiny bit near the pins on a couple of the razors, I'd leave them alone. I don't know anything about working with ivory, but I'd just see if there's a way to reinforce the original material somehow. I bet they'd have to replace the entire scale with new ivory to do any mending. I mean, originally these were two pieces of ivovry put together with the lead spacers, so they'd have to stay that way to be true to the original design. And I don't know who could do that or for how much.

I have an ivory razor with what looks like a lead spacer at the bottom pin also. Probably from around the same era, but it's Swedish. It has what looks like a little crack near the pin, but it doesn't affect it negatively, so... I just chalk it up to it being over a hundred years old. I love ivory.