Characters

Owner	Rafael Alonso Garcia
Observations	ZU CHONGZCHI, mathematician who lived from 429-500 AD, who precisely calculated the n? pi=3.14159265
Country	China
Face value	8
Year	1955
State	Used
Status	Exhibition - Non-transferable
Category	Science
Format	Vertical
Color	ultramar
Other information	Perforated stamp
visualizations	145