I hope you might be able to give me some insight on a set of coffee cups I picked up. They are each marked simply with an overlapping MC with Usa underneath. Looks similar to McCoy Rosewood Olympia or cherokee trademark. However the C looks a little wider.?

Answer:

The M C in this case refers to Mount Clemens, an era of McCoy Pottery Company. In 1967 McCoy was sold to David Chase, a private entrepreneur. Items still carried the McCoy logo but usually had an additional ref. to Mr. Clemens Pottery. This is a design up that McCoy did make so I feel yours are McCoy. I believe the mark was used afterwards on items that were not produced under the McCoy time frame. In 1974 Chase sold the business to Lancaster Colony Corporation and the mark changed once again.