Over the years I have seen a very few SS-M36 service daggers with the Type I chain-set and having iron guards. I noted the tang marking on the three blades I have owned as being the 7 interlinked circles emblem occasionally seen on SS dagger blade tangs. I think there is a picture of such a SS-M36 service dagger in the Wittmann book, page 157 upper left. Wittmann does not state iron guards but describes the shape of the lower guard accurately, the dagger pictured has the characteristic profile of the lower guard found on these "iron" M36's. Overall, the build quality and finish of these "iron" M36 daggers is very impressive, imho.