Digital image of Sylvia Plath's name in a hand-written script
Extracted from this image (via a bibliography gallery at sylviaplath.info), the cover of the uncorrected proof of The Journals of Sylvia Plath printed circa 1982.
The signature may be in Sylvia Plath's handwriting, but it may have also been a stylistic choice to use (someone else's) handwritten lettering for the cover design. Its veracity as Plath's signature cannot be undetermined without further information.
Derivative work (conversion to SVG format): Vasyatka1