Swiss K31 Stamping Question

[lencac]

Hi guys:
I'm restoring this K31. Usually the stamping behind the serial number is the Sig stamp, little tiny rifle
The circle I don't know about.
Anybody?

 

[dprice3844444]

http://www.swissrifles.com/proofs this help any?

 

[zfk55]

Schweitzeriche Industrie Gesellschaft proof.

 

[lencac]

Interesting, except I don't see that mark in any of the list from the link previously provided.
But I gather it's still a SIG marking, yes?

 

[zfk55]

If it's a rifle with or without the "N", it's the SIG stamp. I'm pretty sure the "N" is Neuhausen. It can also be just the "N" without the rifle.