> One tid-bit: NYSE used a similar decimal/quaternary system until early 2001.

Prior to decimal pricing, us exchanges priced in eighths. An article [1] I found from a source I don't recognize says that there was briefly trading in sixteenths, but I guess I wasn't following the stock markets that closely then and I missed it.

https://tontinecoffeehouse.com/2018/11/05/pricing-in-eighths...