The  Alfred Hitchcock " Miniatures and matte painting"

The ring (1927)

Cinematography by Jack E. Cox
Tricks shot by Eugene Schuftan
Matte paintings: Walter Percy Day

While still resident in France, the Elstree studios summonsed Walter Percy Day to shoot the visual effects for a British silent, Alfred Hitchcock's The Ring (1927). For this film, he learned the Shufftan shot, a process which involves the use of a scale model and a mirror. He was trained directly by the inventor Eugene Shüfftan, (or Shuftan) who was invited over from Germany by the British International Pictures . By angling the mirror at forty-five degrees, it was possible to reflect a miniature or a painting, or a photograph, and to superimpose it over the live action set, seen through the clear proportions of the glass.
A Shuftan shot was used for the boxing ring scene at the Albert Hall, the first British film in which this process was used.

Background miniatures .

Trick shot probably done using Schuftan process.