There were chips made on the zigzag mold up until the 1970's or even later.
The mold was only donated to Nevada Historical Society in recent times. Noll was just the distributor, after he retired/closed/died or whatever Burt may have supplied to others just like happened to many other molds.
The Royal zigzags were in a Vegas dealers inventory in quantity over 20 years ago and listed in the very first chip rack. I believe they are Henderson.