Does anyone recognize or now what this gunsmith or manufacturer marking is?

It looks to be an "SK" or "CK" or just a cursive "K" stamped on the barrel forward of the receiver ring. It is on a fairly well done Mauser 98 sporter rifle which also stamped "Cal 30-06" with serial number.

Click on the pictures for a larger view and then click the picture again in lensdump to see the markings.

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Last edited by falcon007; 04/11/19.