I was passing through my local Goodwill today and happened upon a piece that raised a lot of questions for me. It's an 11 inch skillet, aluminum on the outside, stainless inner. It has the All Clad handle, three rivets, but no embossing or mark anywhere. I purchased it, as it was $5 and made me curious. I put in a little time trying to research, and found vintage AC that had the rough textured handle like mine, and three rivets...but they were stamped on the bottom. Was there ever a series of AC that wasn't marked? Is this a knock off of some sort? I'm sure there's no way to definitively answer w/o pictures (I will post them if necessary)...but any sort of help would be appreciated.