The year is before 1921 and Mr Harry Soref the founder of “Master Lock” is traveling across the U.S, making some locksmith. in that year he had invented a lock for protecting military equipment. And had founded the “Master Key” company for making master “skeleton” keys:
The Superbowl ad
In 1973 during a Superbowl game they spent almost all of their entire annual marketing budget on a single commercial. The ad presented a sharpshooter shooting at one of their padlock’s, proving its durability.