It's also listed as CONECA: 1-O-III and Crawford: CDDO-001 I don't think any of them have it wrong.
Let me explain it to those unfamiliar with class 3 doubling;
The CONECA 1-0-III is listed as Class III, Design Hub Doubling. There are nine basic classes of doubled dies.
Design hub doubling occurs when at least two different master dies are used to make a working hub. Each having differences in the design features. Then for some reason, one of each working hub is used to make the working die. The difference in design will create the doubling on the working die. The doubling is on th