Well, if you look at the 1970 catalog page for the Sprite, you'll see that it wasn't yet the "Sprite 27" and only came in "Coffee." My '71 catalog only lists the top road bikes, I don't have the '72 catalog, and by '73 the Sprite was called the "Sprite 27" but the fork didn't have the thimble in the fork crown any longer. So I'd guess it's a '71 or a '72.

Neal