Thanks to Brian of Cool and Collected, I finally have my hands on The Bat!
he isn't a Hot Wheel collector and I am ;) (Yes, he found himself one too!)
It is, at least, die-cast (the top part, anyways.)
A Bat vehicle is a Bat vehicle no matter how you slice it!
From the cardback:
Birthplace: Gotham City
Designer: Wayne Industries
Specialty: The first flying vehicle in the Dark Knight's crime-fighting arsenal, THE BAT features twin mounted cannons. It's maneuverability allows BATMAN to engage in low-altitude pursuits amid the skyscrapers of downtown GOTHAM CITY.