Sigmund Landau (1898-1962), Mother with child

Carbon drawing on Canson cardboard. Dimensions: 48.5 x 63 cm
Handwritten signature: p.d.: Landau An illegible pencil inscription above the signature.
Interesting fact: There is also a sketch on the back, but access to it is difficult,
as the cardboard is glued in four corners to cardboard.
Condition as seen in the photos