Ginga Nagareboshi Gin Menko Cards from the 80’s. A complete set of 40 cards. The cards are made of cardboard like material and are pretty thick.
The menko cards were probably sold with chocolate bars since so many of them contain chocolate stains. The cards were used in very popular menko card throwing game in Japan. That and the thing that they probably were sold with chocolate bars is why so many of the menko cards on the market are in bad condition.
Menko cards are or at least they were pretty hard to come by at the time I collected these. It took me many years to complete my menko card collection. So if you want to collect these prepare for a long project.