Thinking this is Chinese. The weird cable guides are screaming Joe Murray design IMHO, I can not say it is a Voodoo. Came from the same place that eventually went on to do Airborne, Van Nicholas (and a whole bunch of others for other markets?).
Thanks for those links and chiming in on what you may think the frame is. The flanges/stepped head tube next to the cups, I am still hoping is a dead giveaway feature to someone. I tried searching for information on the names you mentioned, but I still do not come up with definitive examples in photos. Perhaps this frame is so bad ass it is unidentifiable!
Interesting. Yeah, the lack of a serial number is a peculiar clue. The rear drop outs, which I measured with a caliper when I took the pictures above, are 7mm or 8mm thick iirc. They are BEEFY dropouts. They are thicker than my Serotta ATi and this unknown frame, the dropout thickness is closer to my Specialized M2 S-Works Stumpjumper Team frame. They are chunky, beefy dropouts.