| Name | Issues/Designs | |||
| 3rd World Telecommunications Exhibition | 1979 | — | - ..., Geneva syns. 3rd World Telecommunications Exhibition, Geneva | |
| |
wrestler | — | — | syns. wrestlers |
| |
Wright brothers | — | — | d - Wright brothers 1977 |
| |
Xenophora digitata | — | — | d - Xenophora digitata 1972 |
| |
Xyrichthys novacula | — | — | d - Xyrichthys novacula 1973 |
| |
yellow-backed duiker | — | — | syns. Cephalophus silvicultor |
| |
yellow-billed stork | — | — | syns. Ibis ibis, Mycteria ibis |
| |
yellow-winged bat | — | — | syns. Lavia frons |
| |
zebra duiker | — | — | syns. banded duiker, Cephalophus zebra, zebra antelope |
| |
Zeppelin LZ 120 Bodensee | — | — | syns. Bodensee LZ 120 |