Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
You asked: "Do you know of any two headed bronzes ?"
The answer is yes; and here is an example of one that features Antoninus Pius and Marcus Aurelius. This may not be your exact coin, but I believe it's the right two monarchs.