IMO, this design was the best shooting bow Chris has ever made, bar none. I had a couple like it...one grey laminate and one brown laminate. Both were tack drivers and very stable and accurate bows, but a tiny bit noiser than I like. They were not noisy as far as recurves go, but I have primarily been a longbow shooter, and like whisper quiet bows. Back when he made mine, they only cost around $650-675 or so new. I don't remember exactly. Times have changed as he now charges about $1000 more than that and I don't believe his newer designs are as forgiving as this bow's design was. I suspect you will be very happy with it.
I don't remember exactly, but I think B1 (or R1 or whatever letters he used) stood for brown laminates, and G1 or R2 (whatever he used) stood for grey laminated maple, then he also had a camo (mult-colored laminate), and later he expanded into the zebra woods, bocote, and cocobollo...which he used other designations for. I am sure the "Z" in the WZ does indeed in some way stand for zebra wood, but I would be surprised to hear that he used wenge (which is a black and dark brown wood). I believe the "points" on all his risers were fiberglass, and not of wood. I could of course be mistaken about that though. The center of your riser and the "fadeout" material in your limbs appear to be of walnut color so I wonder if that is what the "W" stands for.