X | 40k | bl | D.I. Mendeleev | |||
X | 40k | brn | Timiryasev | |||
X | 40k | brnblk | Tsiolkovsky | |||
X | 40k | vio | Kovalevskaya | |||
X | 40k | dkbl | Kovalevski | |||
X | 40k | grn | A.N. Lodygin | |||
X | 40k | grayblk | Yablochkov | |||
X | 40k | orgred | Butlerov | |||
X | 40k | vio | Krascheninnikov | |||
X | 40k | brn | Lobachevsky | |||
X | 40k | orgred | Miklukho-Maklai | |||
- | 40k | grn | Stoletov | |||
X | 40k | Alexey Svertzov | ||||
X | 40k | Kurnakov | ||||
X | 40k | Lebedev | ||||
X | 40k | Kozlov |
X | $400 | dove triangle | ||||
X | $800 | dove triangle | ||||
X | $1000 | dove triangle |
- | 10c | car | workers digging Culebra Cut |
- | 1w | bl | ||||
- | 1w | bl | ||||
- | 1w | bl | 1957 Reprint. Size 22mm Perf: 10½ or Roul | |||
- | 1w | bl | ||||
- | 1w | rose | ||||
- | 1w | bl | 1957 Reprint. Perf: 9 | — | — | |
- | 1w | red | 1957 Reprint | |||
- | 2w | bl | ||||
- | 2w | rose | ||||
- | 2w | blk | 1957 Reprint. Width 22½ Perf: 10 x 10½ or roul |