The breech block was proofed with a crown over "N", which indicates that it was "Nitro" proofed for commercial sale.
There wasn't a date on top of these commercial Luger receivers.
If I'm reading it correctly, your Luger is serial number 8682f. I don't have my reference here, but that would put it somewhere in the early 1920s. My commercial with a "m" suffix was from 1923. Without references, I'd guess 1922.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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