J. M. Petzval, J. Strouhal and V. Jarnik
50 h 1987
Czechoslovakia
0.09 - 0.11$
price on 07.12.2022
J. M. Petzval (1807-1891), J. Strouhal (1850-1922) and V. Jarnik (1848-1923).
| Country: | Czechoslovakia |
| Type: | Postage stamps |
| Series: | 125th Anniv. of Union of Czech Mathematicians and Physicists |
| Nominal: | 50 h |
| Year: | 1987 |
| Material: | Fluorescent paper (fl2) |
| Size: | 53 x 22 mm |
| Perforation: | comb 11¼ x 12 |
| Mintage: | 14,940,000 |
125th Anniv. of Union of Czech Mathematicians and Physicists
 Mathematical Clock, and Theory of Functions Diagram 0.11$ |  Geographical Measurement (1672) 0.22$ |  J. M. Petzval, J. Strouhal and V. Jarnik 0.09$ |