Within the past few months, there was a nice discussion about when the different versions of the Hard Rock roulette chips were introduced. Also discussed was the information within the chip rack about these chips.

Jerry Birl who is very well versed in roulette chip collecting posted some great information that maybe answers your question.

You can actually search the chip board message history/database looking for old threads. I'd suggest searching the archives (link at the top of most of the chip board pages) for that particular thread.