My job takes me all over Texas, so I found this at a antique shop in a little town in west Texas. I didn’t need another # 3 skillet but I liked it. Let’s see if am right on this one. First, it’s a no notch Lodge #3, the “S” is the mold marker. The little + is the makers mark or signature markings. Let me know if I’m right or I need to hit the books harder and study more. I’m just a weekend warrior who is learning to love CI.