I am not a patent attorney, but my understanding is that a "patent reissue" marking means that the original patent had an error in it and needed to be corrected.
Ok, thanks.
I also have a #3NM with the "Reissue" marking.
#12723, blue, 6.5in. barrel, checkered walnut grips.
No imperial japanese navy marking.
What's the meaning of the "Reissue 1871" marking?