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Answering a similar question, Tony Edwards gave the following response:
"I believe the code "N" stands for the Northern Circuit and "S" for the Southern Circuit for the Indian Army inspectors. These were inspection areas, but how it quite worked I have not yet fathomed.
Whether there were two production lines at Dum Dum, one for each army inspection area I do not know. It is something I will try to get round to researching one day."
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