Arco lamp?

I was given a lamp which I think may be an original Arco, but I can't figure out the shade situation. It was missing the shade, and I finally found one online. However, when I received it, I realized the reflector is a different type. It is larger in diameter, and the perforations are much smaller than the ones I see online. I can't seem to find anything like it to compare. Has anyone ever seen an Arco with this type of a reflector, and where I might me able to find the correct shade? I'm thinking there has to be some type of a shade that goes over the reflector, as this is just hanging by the cord, & also has some little foam protector circles that someone has put on it....most likely where the shade went. Does anyone know how to determine if this is an original Arco? There are no markings on it. I was told it was purchased in the 60's.