The 2016 mint set contains four unused coins.There are a total of nine different 100 yen commemorative coins for the Shinkansen.
2015(Heisei 27 year)
Tokaido Shinkansen 100 yen Clad Coin
Sanyo Shinkansen 100 yen Clad Coin
Tohoku Shinkansen 100 yen Clad Coin
Joetsu Shinkansen 100 yen Clad Coin
Hokuriku Shinkansen 100 yen Clad Coin
2016(Heisei 28 year)
Yamagata Shinkansen 100 yen Clad Coin
Akita Shinkansen 100 yen Clad Coin
Kyushu Shinkansen 100 yen Clad Coin
Hokkaido Shinkansen 100 yen Clad Coin
More 2016 coins were issued than 2015 coins.
From what was said at the time, the difficulty of obtaining the coins was slightly higher for the 2015 issue.
