Well, the manufacturer Josef Hack (RZM 7/103) is for sure rare and the manufacturer Carl Eickhorn (RZM 7/66) is for sure very common, but... In case of RZM daggers the rarity doesn't play a big role. I would definitely take the Eickhorn. Besides much better condition, it is a transitional model (with both factory log and RZM symbol), always more desired than late RZM model.
But not as desirable as an early maker SA dagger. Like already said, go for the best conditioned and early maker dagger if possible and you won't be sorry.
