Here's just one search from the BCN archive....get a nice big cup of coffee...

http://beadcollector.net/cgi-bin/anyboard.cgi?fvp=/openforum/&cmd=get&cG=9363136343&zu=3936313437&v=2&gV=0&p=

The one I used to have (now happily residing in another forum member's pile) also has a flat-ish back side. That is how they are sometimes shaped. This bead is slightly under 2 ounces - huge.