It's interesting and cute. Thanks for posting it.

I'm pretty sure that it's a fake, especially when I look at the area around the perforation, which doesn't look at all like an authentic Jatim to me. But it's so beaten up it's a little difficult to be certain. Many of the fakes made in the late 90s and early 00s would blow up spontaneously because they were so poorly annealed, and when I spent several weeks a couple of years ago driving round to villages near Jember, I was sometimes shown broken fakes by innocent-seeming folk who possibly did think they were fragments of authentic beads.

In addition to the perforation, the bird canes in yours don't look right to me either. They're better than most of the fakes I've seen but the reddish brown areas seem very arbitrary (those red lines on the white feathers, for instance), whereas in the very rare originals red is used specifically to represent the beaks and legs only.

For comparison, I'll attach an image I've shown before; it's of Korean National Treasure 634, a Jatim that was excavated from a royal tomb dated to around the year 500. What do you think?

All the best,

Will