I read the subject of the thread and immediately thought the question was whether the stamp should be read as NS or SN. Should it should be NS for nickel steel? Students always ask me why the natural logarithm is always ln and not nl - to which the reply is always that not every smart person in the history of the world spoke or speaks English.
The top picture looks like it reads NS, as the top curl on the S looks slightly smaller - kind of like a 5 is no longer a 5 when upside down. Sorry I can't help you with the part, but maybe I saved you the trouble of typing the extra "or SN" in the future...unless I'm completely wrong in which case I'll learn something new, and thanks in advance!
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