I think you will find that this particular "Seibu" has nothing to do with the department stores. This is a "pachinko token", used in Japanese gaming parlours.
Pachinko is a peculiarly Japanese form of entertainment, best described as a cross between a Las Vegas style poker machine and a pinball machine; playing it requires a combination of luck and skill. Gambling for cash is illegal in Japan, so pachinko players win tokens, which are then exchanged for cash.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis