Actually the only daggers with cast iron fittings I know are RZM Helbigs and these are very controversial. You can find them at serious dealers sites being sold as originals, but in opinion of some respectable long time collectors (e.g.Ron Weinand) they are post war Atwood product. There is one SS RZM Helbig presented in Wittmann Vol.IV and is described as an original piece. I handled couple of NSKK's Helbigs and I must say they looked decades old, no doubt about it, but if really Atwood "made" them (using many original parts), it was long time ago, so they are naturally aged.
