Dear Fred, do these fit the bill? I have taken a couple more that show the aperture better, I will post if they would be helpful. The apertures are definitely countersunk, it seems like one side slightly more so than the other. The way the cord has abraded them makes the edges very soft. Not sure they are technically ojime, but they're glass of the Edo period I think.

I love both of the beads bsteinberg shows, so beautiful! Just my two cents from my very untrained eye, but the one on the left seems loosely made compared to the one on the right. Everything about the bead on the right, from basic shape to the inter-twined threads, is tighter. It seems more artfully done in general? -Mel