Gentlemen, My friend found this SOG somewhere... Could you help me please with my questions: 1. Why there is no manufacturing country stamp? Does it mean made in the USA? How long ago? Fake one from China? 2. The blade is not finished with any modern finishes, looks like standard gun blueing? - Ami right? 3. Is this an original sheath? 4. Any other historical info? THANK YOU ALL in advance! and sorry for Cell phone pictures There are pictures of this knife: Thank you all again for looking!