Re: Need value for a Detroit casino chip...
That one is CG07693 and is the more common one. It remained in use throughout the period of the original casino's operation (as you said, it was a stand-alone before they built the hotel and new casino).
I can't give you a firm value, but they appear to be in the $1 to $2 range if near mint. i sold and traded a few over the years for that range.