Gerda WEGENER (Denmark, 1886 - 1940) - "Secret de jeunesse" (GYRALDOSE). c.1924. Original ink and wash drawing on cream wove paper. Preparatory drawing to illustrate an advertisement for GYRALDOSE pharmacy in a magazine published in 1924 (for women's intimate care). Signed in ink by the artist. Annotated "Gyraldose" in pencil at foot of sheet. 41.8 x 33.6 cm. Condition A (thumbtack hole in the corners, left edge of the sheet slightly insolate, slight traces of handling).