Commemorative coin https://en.numista.com/catalogue/pieces9253.html Standard Circulation coin https://en.numista.com/catalogue/pieces1589.html
In case you're curious, here is a rough translation of the coins' text with some more information below: Commemorative 1975 Okinawa Expo - Cupronickel The first picture shows the coin upside-down. 日本国 - basically means "Country of Japan," pronounced "Nihon Koku" 百円 - 100 Yen, pronounced "Hyaku En" 昭和50年 - 50th year of the reign of Emperor Showa (Hirohito) or 1975, pronounced "Showa Go Juu Nen." 1968 100 Yen - Cupronickel Same as coin above, except: 昭和43年 - 43rd year of the reign of Emperor Showa (Hirohito) or 1968, pronounced "Showa Yon Juu San Nen." Both coins are fairly common and contain no silver. The 1968 100 Yen still circulates, so it is worth basically 100 Yen today, or about 90 cents US. According to the JNDA (a Japanese Coin price guide), 120,000,000 of The 1975 Okinawa commemorative were minted and it has a current value of around 200 Yen, or $1.79 US in uncirculated condition.