It's not unusual at all to see the tabby markings in most breeds and all colors because ALL domestic cats carry the tabby gene. It goes back to the ancient Egyptian days and is almost always accompanied by the 'M' on their foreheads. The M stands for mother goddess, the Virgin Mary, and many other long-forgotten reasons! Remember, cats were worshipped during ancient times, I'm sure they would LOVE to return to those times, I think they have been trying to revert us since!