New source material from Carolinabiblioteket.
Taken at Dahllöf, Hamngatan 38 in Stockholm. The caption reads, "Mrs. Franck and Mr. Sundgren--in sportswear on a skating trip in a photo studio in Stockhom around 1890. Photography by Alfred Dahllöf (1844-1908)."
Think they're standing on skates on, like, a carpet inside? Newspapers report they were professionals, or at least in national competitions--but you knew that from the pants. Okay, and the stance.
*This was totally a joke, but a little Wikipedia research reveals Salchow was Swedish! These guys were before his time. And the first triple was 1955. So maybe they did the triple Sundgren.