Professor August Kekulé (1829-1896), Benzene Formula 3 fr — Belgium, 1966
Professor August Kekulé (1829-1896), Benzene Formula (Belgium, 1966), face value 3 fr, “Chemistry” series. Photo, catalogue value, details and photo…
- Series
- Chemistry
- Issue date
- 1966
- Face value
- 3 fr
- Colors
- Light blue | Violet brown
- Print run
- 10,500,000