| Unidentified photographer (Russian?) Grand Duke Konstantin Nikolaevich and Grand Duchess Alexandra Iosifovna (Princess Alexandra of Saxe-Altenburg) on horseback 1860s Albumen print Internet - Original source ill-defined Brought to my attention by Romy Klessen (Facebook, Carte de Visite and Cabinet Card Photography, 28 December 2018) LL/86543
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