I received this from someone who replied to me about this unusual Marking of the NI or IN between the Blade and Ear of this Front Sight. I did put this side by side by a Niedner N marked on back side where you normally see the Marking and there is a SLIGHT difference, but just thought maybe it was made earlier before Niedner started using the N and Other Markings on the back of the bottom on the Usual Spot you see Niedner Marked T1 Front Sights.