42 s., 'Silurian' (Sigillaria trunk, Equisetales, and Lycopoda),
50 s., 'Cambrian' (Olenoides [top and center], Waptia [top left],
Lancastria? [bottom left], Marrella [bottom right]),
57 s., 'Carboniferous' (Equisetales),
1 T$., 'Carboniferous' (Lepidodendron, Meganeura, Ichthyostega, Eusthenopteron),
1.50 T$., 'Jurassic' (Pterodactyl, Stegosaurus),
2 T$., 'Jurassic' (Archaeopteryx, Morganucodon?),
5 T$., 'Pleistocene' (Homo erectus?).
Part of a set.
Issue date: 6-th of June.
| C a t a l o g u e n u m b e r s | |||
 |
146-152, 8 |  |
124-132 |
 |
112-115, 120-123, 8 |
 |
115-121 |
Sheet 'World Stamp Expo '89 Washington D.C. / XX UPU Congress'
Same set with different values, 6 @ 32 s., 6 @ 42 s., 5 @ 57 s.
Sheet also with 'SPECIMEN' printed on each stamp.
Issue date: 17-th of November.
If chronological order was intended, the images on the 42 s. and the 50 s. stamps should be swapped.
The species on the 1 T$. stamp are Devonian rather than Carboniferous.
The Pterosaur on the 1.50 T$. stamp looks like the Cretaceous Pteranodon.
The Archaeopteryx fossil shown is the Berlin specimen, but in the wrong kind and shape of rock.
