Robert Schmit has confirmed the authenticity of this work.
This pastel, dated 1863, is a preparatory study for Boudin's oil painting of the following year, La plage de Trouville, now in the Musée d'Orsay, Paris (fig.1).
fig. 1 Eugène Boudin, La plage de Trouville, 1864
(Musée d'Orsay, Paris)
© Photo RMN - Hervé Lewandowksi