All of the momo Vintage Label stuff is "the deepest pure indigo." Before soaking, they are as dark as any raw denim I have seen. The styles noted by EricW (702 and BOM-006) are not classic indigo styles. It seemed like you were looking for something like your NFxMomotaros. If that's the case, check out momotaro vintage label (201, 701, or 901); its a very dark, but still classic, blue.