Zu Chongzhi and value of pi 2.90 HK$ — Hong-Kong, 2015
Zu Chongzhi and value of pi (Hong-Kong, 2015), face value 2.90 HK$, “Scientists in Ancient China” series. Photo, catalogue value, details and photo…
- Series
- Scientists in Ancient China
- Issue date
- 2015
- Face value
- 2.90 HK$
- Colors
- Multicolor
- Yvert
- HK 1813
- Michel
- HK 2011
- Stanley Gibbons
- HK 1986
- Scott
- HK 1752