Recordings by 'Viennese Qt'

Here is a discography of 2 phonograph recordings by "Viennese Qt" :

Lullaby - GREY GULL (1920 - 1930) - 4218 - matrix: 2902=B; ~3 min

Merry Widow Waltz - GREY GULL (1920 - 1930) - 4218 - matrix: 2900=A; ~3 min