I look at this spring and my mind goes. What does the man who had this do for a living? Obviously not a knife maker or he would not have sold it!!
About a month ago, I pulled a thick axle spring but found it marked S4110. It seems like low carbon, too. Weird thing was all my research only turned up 4110 stainless. Its not stainless.so much for the idea that all springs are 5160!
I know where there are four, locally, just like yours, if I remember right. I was thinking about getting them, but now maybe I don't need too. Thanks Fred. Your post and time saved me money and land ownership hassle.The spring turns out to be 4130