Well, actually, the original (Gen 1) Senderos were a blued finish, with a heavy varmint contour non-fluted blued barrel, with a jeweled bolt, and in an HS Precision stock.
Then came the Gen II, A.K.A. - Sendero SF (Stainless Fluted, which uses the same stock as the Gen I Sendero, but utilizes the stainless reciever, and stainless fluted barrel). These are my absolute favorite Generation, because it is what my first Sendero is/was.
Then we have the Gen III (Current generation), the Sendero SFII (which has the distinctive black flutes, and the HS Stock with the heavy palmswell).
Disclaimer - All images were borrowed from Google...