Here are the two Harrahs Reno dollar chips from about 20 years ago. The original made in '96 has a small $1 denomination. The reorder several years later has a larger $1 denomination. These are BudJones chip and both are Unused. You might also notice the big circle that sits behind the Harrahs name is a slightly different color on the two varieties. TCR has assigned different catalog numbers to the chips.

I'll send the pair to you for $5 if you have a USA address. I have only the two chips shown that are from my collection.

I believe Greg Susong was among the first to notice the differences and posted about them. His name is on the images that appear in TheChipGuide.