I'm not actually sure: I know you can't find another one in the normal over world, but you might have some luck with digging in the underground.
I'm not sure though, hopefully someone can confirm this for us; I'm quite curious about this too.
Edit: actually, I've been told you can't have another 1; you'll have to trade for it with somebody, or start a new game to get it... I'm not too sure if it's worth it though.
« Last edited by Fwank on Nov 11th 2007 »