This is an example of the "Harrah's" with serifs:

Scan courtesy of ChipGuide.com

This is an example of "Harrah's" without serifs:

Scan courtesy of ChipGuide.com

As already stated, 'serifs' are just little embellishments on letters to make them look fancy, but for some reason, letters with serifs tend to be easier to read in paragraphs. That is why most newspapers and books use a 'times' font. Heck, I even think the 'times' font was named from the New York Times. (But I could be wrong.)

Note also that "Harrah's" with serifs uses a actual apostrophie. Note that the no serifs version (called: sans serifs) does not use an apostrophie and instead uses a four-pointed star symbol. (Hence the one comment about apostrophies. )

Now, about the letter "c" on the TCR number. That does mean cancelled. At one point in the history of those chips, many were cancelled with a drill hole. Later on, some with drill holes were repaired. See the Notes in the TCR about repaired PMSC (aka: brass core) chips. But the point is, drilled versions (with the hole present) are denoted with the "c". Versions that look like they are not drilled, need to be verified that they are not the cancelled version and re-coated with plastic. (Yep, this means an X-ray, but there could be a new test by now.)

I hope this helps!

Jim