Granny, the original colors for the FW are black, green/white, which is a greenish white rather than a stark white, and tan. I think there are some that seem to have more of a greenish tint to them than others, but I might be wrong. the black were made for a lot more years than the others, and the tan ones are the most scarce, I think. The other colors you see are ones that have been repainted, which looks nice, but takes away their historical value, I think.
Keep your eyes out for one. Some have gotten them cheaply at yard sales, auctions and also on Craigslist. Good luck on your hunt.