unknown sad iron

Another find in the basement. I like to think I know a little something about sad irons & trivets, Colebrookdale and Hopewell being in my backyard. But this one here has me baffled!? In the one pic I believe is the makers mark but can't make out, on the side it reads size 2 but hard see s and the z is faint. Can anyone help with the makers mark? Thanks