So a little more research based on the link provided by oslouie yielded interesting results. That link actually shows an Exodus Audio X-12, which was a HT oriented subwoofer put out by Kevin Haskins of Exodus Audio and DIYCable. They also produced an X-15, and later the Tempest-X which was basically the X-15 by a different name. The motor was based on the Brahma, so it had good Xmax of 27-29mm, but they used a 2.5 inch voicecoil, and as such, the power handling and motor force was no where near the original Brahma. Great HT subs in their time, especially given the cost of them. I believe the X-12 went for like $160 shipped, and the X-15 for like $180 shipped.
Does anyone else think it is likely an X-15 or Tempest-X? I found a couple photos of them, and the basket is different, but I don't know how many versions they put out or whether they used different baskets. Given that the dust cap is obviously a Brahma cap, it still may have been rebuilt at some point, or the dust cap just replaced, who knows.