Fred, I could be wrong, but I believe they stamped all the .410 bbls 0000 in anticipation of coming out with a dedicated .410 0000 frame (which they never did), but they were fitted to 28 ga 00 frames. At any rate, there weren't any 0000 framed 28 ga guns, so since the Galazan gun has both sets of bbls, it has to be on a 00 frame. The frame size was only stamped on the barrel lump, not on the frame, so they probably only looked at the .410 bbls. The 28 ga bbls will certainly be stamped 00. Still, $13,000 seems to be not a bad price, even for them, as rare as .410/28 ga sets are (DT too!).
Joe