I do have a couple of one-sided chips where the bulk of the chips (if not the rest of the chips) are 2 sided.

Here is my favorite:

This is the only crest & seal from this Reno joint. I talked to Jim Blanchard about the chip. He had some ideas but nothing definite. He mentioned that inlay could have slipped off the chip before it was pressed. I think it could be a sample. Who knows.