Don’t know who this is from, maybe Durand? It is about 160mm diameter.
The frosting is by sand blasting (or other abrasive blasting). Looks like a stencil was used as you can see in places where the edge of the frosting has spread under the stencil where the stencil wasn’t in contact with the surface, leaving a less sharp fuzzy edge. There are none of the scratches you see when the surface has been abraded by scrubbing (rather than blasting). The tiny pits from the blasting look a similar size to an acid frosted finish but more angular rather than spherical with acid.