The Argentine Waltz - 1935
One of the things that fascinates me about the dances of the Jazz Age is how universal and international the "Modern Dance" sensibility was. Pretty much anywhere you were, from New York to London to Berlin to Buenos Aires the dances were very similar.
Paris and Vienna had some unique takes on the Waltz, but in Argentina, the close-hold, box-step smooth style found in most of the world was also found there, in the home of the Tango. There is today a style of Waltz popular with the Tango crowd that is essentially a Tango in 3/4 time. That doesn't seem to be what's happening here, though to be fair, the Argentine Tango of 1935 was not quite what you generally see danced today either.
Just for contrast, I have also embedded a video of the modern take on the Argentine Waltz.
And here's what's being danced today.