Equestrian statue of Friedrich II / Kronprinzenpalais / Brandenburger Tor. 1860s. 3 albumen prints with rounded corners, mounted to card. Between 21,5 x 17,5 cm and 17 x 23 cm (mounts between 29,2 x 22,3 cm and 26,3 x 34,8 cm). Annotated in black ink below the image on the mounts.

Hendrik Berinson, Natalia Kazmierczak, and Ira Plein, eds. Leopold Ahrendts (1825-1870) und die Frühzeit der Photographie. Berlin: Galerie Berinson, 2011, ill. pp. 17, 59 (variants).
Eberhard Mayer-Wegelin and Sigrid Schulze, eds. Berlin als Residenzstadt: Photographien von Leopold Ahrendts 1854-1870. Munich: Schirmer/Mosel, 2018, ill. pp. 111, 127.