Medium: original lithograph. This impression is from the very small edition of 20 printed on japon paper (180 were printed on Arches wove paper, for a total edition of 200). All were printed by André Clot for the rare "Éloge de Pierre Bonnard" by Léon Werth, published in 1946 by Manuel Bruker.
The lithographs from Éloge are beautiful and subtle -- fine examples of the artist's later work (Bonnard died the next year in 1947). Image size: 5 x 2 3/4 inches (130 x 70mm); the total sheet measures 12 3/4 x 9 3/4 (325 x 250mm). Not signed -- no impressions were hand-signed.
Note: unlike the standard edition, this impression on japon paper is completely without printed text. This fact, along with its greater rarity, accounts for the difference in price.