Patent US 4,637,634

A sales promotional system includes distribution to a consumer of a first sheet including certain elements of a bankable bank draft and providing instructions for obtaining a second sheet including the remaining requisite elements for the bankable bank draft. The participant obtains the second sheet (e.g. by purchasing a designated product) and if the check parts match, combines the first and second sheets to create a bankable entity. Validation procedures are employed to assure that submitted check combinations are genuine.