[I hope this isn't a duplicate post -- I thought I was writing one and it went bye bye.]
I think the ransom note looks much more like the yearbook writing than Patsy's. I don't see that much similarity between Patsy's and the ransom note, myself.
The yearbook sample is obviously very fancy, but most of the letters that aren't fancy are quite similar to the rn, esp. that d!! Weird. Also the y, t, w, a. J and M, as well.
In the Thailand sample, the J and M are similar, and the A is similar to the A in the yearbook. But the A and I in the yearbook and the A and I in the note aren't alike. Which is odd, b/c the M begins with a downstroke, like an m, but sometimes the A does and sometimes it doesn't.
THe U and u are different, too -- in Karr's exemplars, they end with a downstroke, but not in the note.
The e and r are interesting. In the note, they have that little convex thing going on (I remember fashioning mine like that back in, oh, 1976 or so), which is kind of a kid thing. (A girl thing, to be sure.) But they've simplified in the RN, but still have a flatness to that stroke that used to be convex.
In any case, no smoking gun. But intriguing, IM(A)O. (A for amateur)
And lordy, my handwriting changes from day to day, much less what it looked like in high school. Sometimes I loop the tails on my y's, sometimes they are totally straight. Sometimes I make tails on my t's, other times I don't. Maybe I should commit a crime and leave a note!
