Not sure what these are called but the #'s if I read them correctly are; 3 @ 380, 8/14, 466 & 3 @ 423, 8/10, 466. Can anyone tell me if these are correct? Also, the thing-a-ma-gig (I think thats the correct technical term) that looks damaged probably looks that way because of media blasting.
I'm guessing the NF is a inspection stamp.