Found at The Finnish Museum of Photography

Credit from the back: Teatterimuseon Kokoelmat; Toivo Niskanen (1887–1961) & Ja Margit Lilius (s. 1899); Chopin: Valssi 1917

Credit from the back: Teatterimuseon Kokoelmat; Lucia Nifontova (1913–1987) & Arvo Martikainen (1905–1946); Tshaikovski: Prinsessa Ruusunen 1938

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Found these postcards in the shop of The Finnish Museum of Photography in Helsinki