Beecham's Oracle Reveals a Secret if You Apply a Red-Hot Wire
Beecham's Oracle by Royal Letters Patent
A most unusual piece of advertising, this 7.5x5" piece of paper says that you should fold back the edges so that it stands raised, apply a red-hot wire to the star at the lower right corner and the "Oracle" will reveal its secret. This is an advertisement for Beecham's Pills and while not dated, I did find a date online of 1909.
Beecham's Little Pills
Click images to view larger