It seems to be a pretty common color, as there are horses out there the same patterns with silver and dun on top. But you can breed her to silver duns and get closer to a rare color.
Dunno. Not rated, so no idea how rare the coat is. But she would probably be a good mare to start with if you can find stallions with lots of patterns to pair her with.
Ooh that's cool :D I'm hoping we take our Lake Superior boat out of storage early this year, we usually don't get it into the marina until late, which is so annoying. The best fishing is in May when the bay is still cold before the fish move out deeper.