I have been studying the repro's for several years now...best I can come up with is.. way less guns actualy did get finished in any BHE grades and any sets with 410 barrels. I beleive the listed numbers for the 410-s was pre-flud and some or several 410 barrels sets were lost. Only 30 sets of 410 barrels were to have been completed when the factory closed. Of them 30 some were lost to the flud. I know of 9 DHE guns by S.N. I think 5 to 10 A-1 exist and only a couple BH grades. As for the 0000 frame prototype, the one Chadicks sold was listed as the only one made!....still a 2nd 0000 gun may exist? If I was a betting man I would say 15-20 guns or less total exist in 410 gauge! Of the ones that I know of only 4 DH grades have two triggers all the rest have been single. Two of those four are for sale as I write this. I will continue to keep track of any 410 guns that come up for sale by S.N. and or discription (if posible). I own two DH grade DT-PG 28/410 sets at this time, one has 2 splinters and the 3 barrel set has two BTF. My two barrel set is as new with little to no use showing and my 3 barrel set Im shooting...(-: it shows loss of color case and some light scuffs. Its 6lbs-4oz. I can't beleve how many sporting clays the 410 can break...would not have ever guesed! thanks all Kenny Graft SXS ohio...(-: