Today's chip is 3rd in a series of pink 25 centers from Harrah's Reno / Lake Tahoe. This one is 10th issue, N5130, released in 1970.

The similar inlay and color patterns remain, but the edgespots are not split, and the mold is hat & cane. It is interesting that the 60's seem to be the time pink becomes one of the standards for a fractional color. Maybe this push by Harrah's had something to do with it....