Lot 529: Albert Oppenheim (German, 20th Century)

Albert Oppenheim (German, 20th Century)
A busy canal (illustrated); Trees from the rooftops; and View across the plains
the first signed 'O.' (lower right); the third signed with initials and dated '21.4./25' (lower right)
pencil and coloured crayon, unframed
19¾ x 14.13/8 in. (50.2 x 36.5 cm.); and three unframed watercolour studies of river banks and street scenes by the same hand (6)