Every card in my type collection is technically equal. My 1989 Topps base card is just as important to finishing my collection as a 1/1 Babe Ruth autograph. In fact, since I focus most on base cards, followed by inserts, I would argue that the '89 Topps nickel box single is more important.
But nickel box singles are a dime a dozen. And mainstream cards aren't so hard to find; even "rare" parallels and inserts can be found online somewhere. It's the regional and team issues that I find most challenging to locate. And in Japan, I'm pretty sure the vast majority of them are uncatalogued.
So these team issues are more exciting to find, even if they are "equal" to the base cards.
The card has an interesting holographic foil coating, which showed up in my scan. Each card has four different photos, and the season slogan can be found on the back.
The final three cards were issued by the Swallows in 2008. They are parallels, as noted below.