Nippon TV and Hideki Matsui teamed up in 1993 to start the Hideki Matsui Home Run Card club.
For every home run Matsui hits, a baseball card featuring an image of that particular home run swing, along with other details from the game, is printed.
Since 1993, Matsui has hit 472 home runs between the MLB and the NPB -- there is a card for each of those home runs. In all, some 30,000,000 cards have been printed over the years; and there are currently some 30,000 people that own all 472 cards.
And now it seems that the team working on the Matsui Home Run Card will be checking to see if they can get this listed in the Guinness Book of World Records as the longest running (and perhaps most ambitious) baseball card business plan.
Incidentally, the whole reason why this was even started was to document Matsui's progress toward breaking Sadaharu Oh's home run record of 868.
Via Nikkan Sports