More precisely, this is a discounted bus and train commuter ticket for students and office workers, and is valid only for travel between certain stations and at certain times.
The pass in the time capsule is a three-month pass valid for the Keihin Line.
The '70s marked the start of the age of mass transit. The rush-hour commute to and from metropolitan areas became seriously congested, and came to be known as the "commuting hell." The moretsu, or zealous, office workers who put up with the commute were like "corporate warriors" who made possible their nation's economic growth.
On the other hand, villages in the mountains and other remote areas were emptied, causing a serious population imbalance between urban and rural areas. In April 1970, the government sought to redress the imbalance by implementing its Depopulated Area Policy Emergency Measure.