Soon as I saw that coil spring I thought of Bob Kern. He was a local man here in Ligonier, Pa which is near my home. We used to visit him and his shop when still in high school around 69-70-71 or so. Mr, Kern kept us straight in many ways and probably saved our lives.
I have a couple real nice trigger gds and maybe a butt plate marked KERN.
He was a grand old guy to us. My very first build was all from his shop. What a mess, but safe thanks to him.