"Romina"
These early, vinyl Samantha Parkington look-alikes can sometimes be found on eBay, though almost always they need to be restrung and a number of them seem to have a pinched torso from extended time on a doll stand.
If the face has a mold number, I'm not aware what it is; the neck only reads "Gotz Puppe." But back in the 1980s, Gotz's name for one of the associated dolls was "Romina" before the sculpt was purchased by Pleasant Rowland for her fledgling business The Pleasant Company (later American Girl). I've heard this face referred to as the American Girl prototype, so that's what I call it (though it's not actually, if you want to get technical).
There are minor differences between this sculpt and the Pleasant Company/ American Girl sculpts. For example, Pleasant Company dolls have larger teeth, but they are overall nearly identical. However, the smaller, thinner vinyl torso of the Gotz dolls is what mainly differentiates most of them from their Pleasant Company successors.
PLEASANT COMPANY SAMANTHA AND GOTZ "ROMINA"