The Imperial Mistress is the "Imperial" version of a very drinkable ale known as the Citrus Mistress, made by Hop Valley Brewing Co., located about an hour south of where I reside. The Imperial Mistress with its higher alcohol content gives it a warmer, maltier profile that balances very well with the otherwise citrusy bitterness that is accentuated by the Grapefruit and copious amounts of hops.
The bottle opener is indeed a mermaid. It is a favorite. Even though it is big and heavy, being that is is a large hunk of cast metal, it sits quite comfortably in the hand.