Sharp eye, Raimey. You have spotted two of the customized items.
1. The wood is not from the Simson factory, but Claro walnut from California; custom wood work is by B. Dudley. It includes a right hand palm swell, cheek piece, steel grip cap, sling swivel stud, and Kick Ez pad.
2. The silver S is for my last name, but works for Simson also. Work done here in Dallas.
3. There is another good one and if you do not find it soon, I will attach a pic later.
I found no Simson Triangles anywhere and will see about pix of flats and water tables.