HPL typed MS of "The Unnameable" on ebay.
Signed MS of the story, with corrections in HPL's hand. The provenance and description leave something to be desired, but to my not very trained eye it looks genuine. According to Schweitzer's Discovering Lovecraft, there is no (known) Lovecraft MS for The Unnameable.
Compare with
this listing from Currey of a posthumous MS prepared by Derleth.