A SAFE BET
If you want to achieve a higher response rate than ever with your mailings, it’s easier than you think. The most promising method is to stimulate your addressee’s curiosity. And what arouses people’s curiosity more than anything else? Locked doors or chests concealing a secret turn any adult into an expectant and excited child. If he’s then given a key to open the lock, he’ll hardly be able to contain himself. He’ll want to know if the key fits and he’ll want to get his hands on the treasure before anyone else.
Variant 2: Mortise lock for doors and glass cabinets.
Duds and winning key made of highgrade and hard-wearing plastic.