Because the various types of swords seem to form a time sequence that gets progressively smaller (probably due to a natural generation-to-generation reductions in size that is a result of a cast being smaller than the mold it was made in), I wanted to compare the volume and surface area of the models. Both of those are easy analytical steps. It turns out that the California sword model actually has a smaller volume (105,824 cubic mm) than the Italian eBay sword model (110,657 cubic mm), despite having a greater surface area (27,588 square mm for California vs. 26,850 square mm for Italian eBay). The Italian eBay sword hilt is clearly smaller than the Italian California sword hilt in terms of linear metrics (about 2.0 percent) and surface area (the 738 square mm difference is about 2.7 percent).
Perhaps the greater volume per unit of surface area of the Italian eBay sword is related to the "smoothing out" of details and fissures as a Type F parent was used to produce a mold for the Type J generation of swords. The thing to do to investigate, I think, would be to find some software that can "subtract" one model from another and see where the differences are if they're scaled to the same size. I'm sure there is software out there that can do that, but I don't know what it is yet or how to do it. Suggestions welcome!