The red chip with a 3 leaf clover on each side is identified as being from Harrah's Reno. It was used as a very early roulette chip. It is TCR# N7509.rd. Other colors have been identified but are very scarce.

Here is a link to the Chip Guide =- you have to scroll down a long ways...

http://www.themogh.org/cg_chip2.php?id=NVREHA

Here is a scan of my chip...