The seat lug is (for me) an indicator that it is not a Ritchey, as far as I know the only Ritchey frames with decorative lugs are the Annapurna (not actually lugs, but look like lugs) and the Canada only bikes assembled in Japan and sold through Rocky Mountain dealers, and I know it's not one of those, because I own one of those. But I am puzzled by the Ritchey logo on the BB shell, as I've never seen that on anything but a Ritchey.
I am, of course, by no means a Ritchey expert, and whilst there is a wealth of knowledge on RBUK, it has to be said that there is a considerably higher percentage of Ritchey fiends on the MTBR VRC forum; if I was you I'd start a thread over there with sone nice clear pictures of the frame details, and a frame number if you can find one.