See if this helps with dating:
https://ithacagun.com/serial-numbers/
Looking at that, it doesn't seem that NID started until into the 20s.
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"I believe that people have a right to decide their own destinies; people own themselves. I also believe that, in a democracy, government exists because (and only so long as) individual citizens give it a 'temporary license to exist'—in exchange for a promise that it will behave itself. In a democracy, you own the government—it doesn't own you."- Frank Zappa
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