| Charles Johan Bergamasco Backmark for "Bergamasco, S. Petersbourg" 1865-1867 Carte de visite, back Private collection of Sergey Maximishin LL/104538 (Sergey Maximishin, 15 September 2020) Bergamasco usually numbered photos that he took for private clients and did not put a number on photos of celebrities intended for sale. The absence of a number indicates that it is photo of a public person.
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