L. Davenport & Co. catalogue, from 15 New Oxford Street
The Demon Sand Trick is advertised on the front cover in colour. The catalogue has 20 pages. The business address, and the fact that the telephone number is Holborn 9012, allow us to date the catalogue between 1927 and 1937. The style of the catalogue suggests the 1930s. Also shown is the inside page which advertises the trick on the cover.