I'm sure is was a likely Silvertowne that minted this commemorative silver round. Winning a national championship is a big deal, for football and basketball.
So, there is usually a commemorative silver round for the champ.
In the case of the basketball championship, it is actually a tournament of 64 teams that compete over the course of 3 weeks. It's more than a single event, it's season ending achievement. Possibly, the Superbowl of college basketball.