I think it would be cool to add tags for the Coin of the Year winners. This is the list of categories from the Wikipedia entry for Coin of the Year:
- Coin of the Year
- Best Bi-metallic
- Best Contemporary Event
- Best Crown
- Best Circulating
- Best Gold
- Best Silver
- Most Popular
- Most Artistic
- Most Historically Significant
- Most Innovative
- Most Inspirational
Overall Coin of the Year winners would have two tags: Coin of the Year and the one for the category that got them into the running (e.g., Best Circulating).