Joe,
Welcome to the Forum.
It is certainly true that the n-block was the transition between 1938 and 1939 production. FYI, transitions in mid-block are not unusual, in fact more the rule.
It is equally true that transitions are exactly that; a transition. There is no clear cut number for a cutover. That's the nature of gun manufacturing all over the world.
The earliest REPORTED 1939 S/42 is 1330n. But the latest 1938 n-block is 6575n. There is an overlap between 1938 and 1939.
So, congratulations, you now have the earliest reported n-block 1939 S/42 for what its worth and that's not much. Unless and until someone comes up with a lower number. Or not.
Hope this helps.
John
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