Interesting, as damned if I can make that hole out in this screenshot from "Obsession" that otherwise shows a great deal of detail, no matter how much I try to brighten it or change the contrast.
It did not appear to be there after the Miarecki restoration, however the following image taken at the time of his resto. does show a hole:
If it was indeed a hanging point from some early part of the model's life, I guess whether it was really still visible at the time of the last FX work would require photographic evidence most of us don't have access to.
Upon review, it appears as if there was a wire going into a hole there, for lighting or whatever.