> 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...
Heh. I've seen the code in the codebase at my previous work that supported not only 1/8 and 1/16 price scales, but all the way up to 1/256... but I don't think I've ever seen a ticker with such price scale outside of unit tests.