2019-S $1 American Innovation DE Rev PR Cannon, Classifying the Stars First Day of Issue PR70 认证号38767956, PCGS号807147

2019-S American Innovation Dollar Reverse Proof (Classifying Stars - DE) PR70 { PCGS-4 }. Delaware astronomer Annie Jump Cannon (1863-1941) helped pave the way for women in science. Among her notable achievements is the creation of the Star Spectra system to classify stars, a system is still in use today. Throughout her decades-long career, Annie Jump Cannon also discovered 300 stars, and contributed greatly to our understanding of astronomy. This reverse proof rendering looks more like the regular strike than the normal proof.