lower right in black ink: JHM [artist's monogram]; center left in graphite by unknown hand: - 3/4 - ; lower center in graphite by unknown hand: Letter to be 3/4 inch long. / 788075 / 19
Corcoran Gallery of Art, Washington, DC; acquired 2015 by the National Gallery of Art
- Corcoran Gallery of Art Catalogue. Washington, DC: Gibson Brothers, 1892, p. 97.