August 13, 1973.
Almost exactly 43 years ago, Ajax Amsterdam and FC Barcelona agreed to terms and Johan Cruyff signed a record transfer fee to become a Barça player. Cruyff was insistent that he end up in the Catalan capital, going so far as to threaten a boycott of the 1974 World Cup to pressure the Dutch federation into cooperating with his exit from the Netherlands.
Barring some manner of omniscience, nobody involved in brokering that deal for Barça truly knew how important Cruyff was destined to become. If they had known, they may well have paid even more.