single date 1920 value/where it came from?

[alvin]

I am totally lost.

So, was gun with n suffix made in 1920 ?? In that case, my Luger was also made in 1920 (I wrongly thought it was made around 1923 in the past).

Or, is n-series with 1920 chamber date unrelated with mine (the chamber on my instance is blank, no year),,, a separate series ??