BC Clark anniversary sale Christmas plates

Most sales are after Christmas, but Clarks is just before….. 4 BC Clark’s anniversary plates.  they’re all the same yet a little different from each other. They all have the same design, but on the back they each have a different year. The one that says 100 anniversary is dated 1992 on the back. Then there’s a 1991, 1993 and a 1995. Each plate is shaped a little bit different than the other one. One is more flat, one is more curved at the edges, and just ranging in between. (and apparently they still sell them.)