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Backmark for P. Sebah
Carte de visite, back, detail
Private collection of John Toohey
The stamp on the back says ""R. Tom-Tom, PrŮs la Poste d'Autriche, Constantinople" this indicates that the studio was ""By the Austrian Post-office" which was presumably a well-known location in Constantinople.
[Thanks to John Stathatos for this clarification.]