Quote - Do you remember for which version of Antonia these were created?

Nope, but I could probably guesstimate.

Quote - The movement also looks consistent across morphs.  If that's so, then the morphs can be analyzed and a base movement for each vertex can be determined, because every vertex is affected by only this unwanted motion (as opposed to the intended morph) in at least one of the morphs.  If that unwanted movement can be isolated, it can be subtracted from the whole set of morphs.

That's an excellent idea. I like the way you think.

Quote - How do you mean it is "irregular", odf?

I mean that at first I thought it was just a simple transformation, such as a rotation plus translation. But I tried to match the morphed head to the original in Wings and found it was more complicated than that.

I didn't think of comparing the morphs to each other. I'm not sure that the deformation is always the same, but it seems that way. Definitely worth the try, if you can be bothered to do the coding.

-- I'm not mad at you, just Westphalian.