This unused postcard is signed H.B.G., indicating the artist H.B. Griggs.
Here's what I found on the web about Griggs: Designer of more than 500 postcards who worked for the firm of Leubrie & Elkus, NYC. The subjects are often for holidays,the style is influenced by Art Nouveau, and the artist signed as HBG.
For everyone dressing up tonight, here's Dorothy Provine, the star of the TV show, The Roaring 20s (it ran from 1960-1962). It was one of my favorite shows. My sister Maria had this paper doll, which I bought years later at a convention. Most of the outfits are early 1960s, but these two flapper dresses were included in the set. Whitman, 1962 (in its own carrying-case folder).