Switzerland
Also existing on ironed granite paper (MiNr. CH 180z)
| Country: | Switzerland |
| Type: | Postage stamps |
| Series: | Airmail |
| Nominal: | 25 Ct. |
| Year: | 1923 |
| Material: | Granite Paper |
| Perforation: | comb 11½ |
| Mintage: | 550,000 |
