I have an M1 Carbine 15 round magazine marked J.L.Clark, C upside down T 'dash' - B, with a type l one base. It’s not a polished/shiny blue, but rather a flat grayish/black. Kind of like a 'light' parkerized finish on both the body and matching base. Can't seem to find any information on this one with a type 1 base and finish? Anyone have any ideas or comments.