Autograph sketchleaf for the “Hammerklavier” Sonata, Opus 106, including drafts of the fugue subject in the last movement. 1 p., oblong quarter, ca. 22 x 29 cm. 8-staves, notations in brown ink on five staves, one hole (?paper flaw) affecting one note, some creasing along former fold, no place or date [Vienna, probably su