Partial 1999 Canada 25 Cent Coin Collection

Partial 1999 Canada 25 Cent Coin Collection, not uncirculated, in a cardboard frame. Start or complete your collection with 7 of the 12 coins, one was issued for each month of the year in recognition of a significant event in Canadian history. Not sure what coin the larger space in the center was for - maybe a dollar coin or a special medallion?