This came from an old magician’s estate and has the original instructions. The instructions say the effect is performed with five keys that will either unlock or not unlock the padlock but only four are included. This does not affect the working of the trick except that you use one less key than stated.
There is a fifth key included that will only open the lock and the instructions tell you how to use this key for another variation of the routine. You can see this key in the picture resting below the lock.
Note: The brass has tarnished over time and will need to be cleaned up for best effect.
Joseph Kolar invented what became known as The Seven Keys to Baldpate effect c. 1927 when he introduced it at a Thayer Night in Chicago. It was popularized and named by Annemann in his book The Book Without a Name. Kolar’s method involved the switch of a key, and since then it has had many variations.
Effect: You show the padlock and how only one key opens the padlock. Now you lock the padlock and hand all the keys to the spectator. They choose all but one and leave the final one to you. Yours is the only one that opens the lock!
Nothing is added or taken away and you can do this close-up or on stage since it is a large, solid padlock. The keys are all different and there are no gimmicks to dispose of. A really wonderful effect.