Pencil and pastel drawing xix paper: naked woman lying on a sheet, signed adam (hugo?), fine arts

Large pastel drawing on paper: naked woman lying on a sheet, necklace around her neck. Signature lower right adam hugo ( Unidentified). 19th century period. Some foxing on the lower part. Reinforced by a master key. Dimensions of the pastel 30 X 45 and with the mat 37 X 54cm. Packaged weight rolled 400g.