The date is circa 1873-1874.
This appears to be the original artwork from which illustrations were made. The business moved into 39/41 New Oxford Street at the end of 1938.
Note the Maskelyne and Cooke advertisement on the back page.
The card is signed by Chung Ling Soo to Alfred Mayhew, Christmas 1914. The folded outer card has inside it a piece of paper that is kept in place with a red, white and blue cord. The greeting is written on this piece of paper. We are grateful to Peter Lane for pointing out that Alfred Mayhew was the brother of Percy Mayhew. Percy was Chung Ling Soo’s Number 2 assistant circa 1912-1916. Alfred joined the Chung Ling Soo show as an assistant around 1913-1914.