Letter with wings
60%
| Country: | Switzerland |
|---|---|
| Issue: | Airmail |
| Date: | 1937-06-01 |
| Paper: | Coated Granite Paper |
| Print: | Typography |
| Perforation: | comb 11½ |
| Emission: | Air Post |
| Format: | Stamp |
| Face Value: | 20 Swiss centime |