Barbie Ponytail Identification Help?

by Dean
(Lisle, IL USA)

Hi, I have a one owner Barbie that was purchased new, but I need help identifying it. She has blue eyes, brown brow, less curved eyebrows, no hole in feet. She's brunette with short hair (was it cut by the owner?) in a ponytail, wrapped with a tiny rubber-band which is disintegrating. Her right buttock says:
Barbie
Pats.Pen
(c)MCMLVIII
by
Mattel
Inc

The "e" in Barbie and the "n" in Pen fade away. I cannot see any sign that there is a T.M. after Barbie.

Her left buttock has an "8" or a "B" on it.

She does not feel hollow. Her skin from the torso up is a little darker than her legs. She does not look ivory at all, but a flesh color. She has to be a 3 or 4, but which one? Thank you for your help, you have a wonderful website.

Hi Dean-
If she has tan skin, she is most likely a #4 -
Vintage Barbie Ponytail Comparison Guide.
Suzanne